是道路設計讓駕駛超速？為什麼「慢一點」反而能讓交通更有效率？

YouTube · PanSci · Native everyday · 2026/05/14

2026/05/14

Speech duration: 14min 35s
Unique characters · 252 once: 744
Word count: 2,917
Average sentence length: 9.7
Length: 15:11
Unique words · 556 once: 974
Syllables per minute: 307
Script: Traditional 繁
Sentences: 462
Difficulty Advanceddifficulty Difficulty is estimated from vocabulary: knowing common words through Level 231 covers about 95% of the words in this content — roughly 1 unfamiliar word in 20, the coverage research links to comfortable listening. Level 231 sits in the Advanced range. How difficulty works: Advanced · 231

Difficulty is estimated from vocabulary: knowing common words through Level 231 covers about 95% of the words in this content — roughly 1 unfamiliar word in 20, the coverage research links to comfortable listening. Level 231 sits in the Advanced range.

TAGSNative everydayScience

Open on YouTube SOURCEYouTube

Vocab coverage

The Level you need to know each share of this video’s words. The dark 95% step is its difficulty.

Lv 5

Lv 37

Lv 114

Lv 231

Beyond

TOCFL coverage

Which TOCFL (TBCL) level each of this video’s words comes from.

TOCFL 1 38%
TOCFL 2 10%
TOCFL 3 8%
TOCFL 4 12%
TOCFL 5 9%
TOCFL 6 6%
TOCFL 7 1%
Not on TOCFL 17%

Cumulative: TOCFL 1–4 covers 68% of the words, TOCFL 1–6 covers 82%, TOCFL 1–7 covers 83%.

Words to learn first

Pick a level to see the words a learner there needs to understand 95% of this video’s words.

Starting from zero (Beginner), learn 825 words to reach 95% of this video’s words.

The 20 most-used of these 825 words.

Word	Pinyin	Meaning (CC-CEDICT)	In video	Level
的	de	of; ~'s (possessive particle); (used after an attribute when it modifies a noun); (used at the end of a declarative sentence for emphasis); (used after a noun, verb or adjective to form a nominal expression, as in 皮革的[pi2 ge2 de5] "one made of leather" or 跑堂兒的\|跑堂儿的[pao3 tang2 r5 de5] "a waiter (literally, one who runs back and forth in a restaurant)" or 新的[xin1 de5] "new one"); also pr. [di4] or [di5] in poetry and songs; really and truly; a taxi; a cab (abbr. for 的士[di1 shi4]); (bound form) bull's-eye; target	182	Lv 1
在	zài	to exist; to be alive; (of sb or sth) to be (located) at; (used before a verb to indicate an action in progress)	58	Lv 1
是	shì	to be (followed by substantives only); correct; right; true; (respectful acknowledgement of a command) very well; (adverb for emphatic assertion); variant of 是[shi4]	49	Lv 1
這	zhè	(pronoun) this; these; (coll.) this; (bound form) this; the (followed by a noun); (bound form) this; these (followed by a classifier) (in this sense, commonly pr. [zhei4], esp. in Beijing)	35	Lv 1
了	le	(completed action marker); (modal particle indicating change of state, situation now); (modal particle intensifying preceding clause); to finish; (used with 得[de2] or 不[bu4] after a verb to express (im)possibility, as in 忘不了[wang4 bu5 liao3] "cannot forget"); (literary) (usually followed by a negative such as 無\|无[wu2] or 不[bu4]) completely (not); entirely (not); (not) in the least; (of eyes) bright; clear-sighted; to understand clearly; to understand clearly (variant of 瞭\|了[liao3]); unofficial variant of 瞭[liao4]	34	Lv 1
到	dào	to reach; to arrive; to leave for; to go to; to (a place); until (a time); up to (a point); (verb complement indicating arriving at a place or reaching a point); considerate; thoughtful; thorough	31	Lv 1
人	rén	person; people; CL:個\|个[ge4],位[wei4]	28	Lv 1
會	huì	can; to have the skill; to know how to; to be likely to; to be sure to; to meet; to get together; meeting; gathering; (suffix) union; group; association; (bound form) a moment (Taiwan pr. [hui3]); (bound form) to reckon accounts	27	Lv 1
速度	sù dù	speed; rate; velocity; (music) tempo; CL:個\|个[ge4]	26	Lv 19
上	shàng	used in 上聲\|上声[shang3 sheng1]; first (of multiple parts); to climb; to get onto; to go up; to attend (class or university); (directional complement) up; (noun suffix) on; above; (bound form) up; upper; above; previous	25	Lv 1
不	bù	no; not so; (bound form) not; un-	24	Lv 1
有	yǒu	to have; there is; (bound form) having; with; -ful; -ed; -al (as in 有意[you3 yi4] intentional)	22	Lv 1
公里	gōng lǐ	kilometer	21	Lv 38
速	sù	fast; rapid; quick; velocity	21	Lv 76
一	yī	one; single; a (article); as soon as; entire; whole; all; throughout; "one" radical in Chinese characters (Kangxi radical 1); also pr. [yao1] for greater clarity when spelling out numbers digit by digit	19	Lv 1
就	jiù	(after a suppositional clause) in that case; then; (after a clause of action) as soon as; immediately after; (same as 就是[jiu4 shi4]) merely; nothing else but; simply; just; precisely; exactly; only; as little as; as much as; as many as; to approach; to move towards; to undertake; to engage in; (often followed by 著\|着[zhe5]) taking advantage of; (of food) to go with; with regard to; concerning; (pattern: 就[jiu4] ... 也[ye3] ...) even if ... still ...; (pattern: 不[bu4] ... 就[jiu4] ...) if not ... then must be ...	18	Lv 1
時	shí	o'clock; time; when; hour; season; period; old variant of 時\|时[shi2]; surname Shi	18	Lv 2
能	néng	can; to be able to; might possibly; ability; (physics) energy; surname Neng	18	Lv 1
讓	ràng	to yield; to permit; to let sb do sth; to have sb do sth; to make sb (feel sad etc); by (indicates the agent in a passive clause, like 被[bei4])	18	Lv 1
駕駛	jià shǐ	to drive (vehicle); to pilot (ship, airplane etc); driver; pilot; captain	18	Lv 30

Is this video right for my Chinese?

A 15-minute video from PanSci with 15 minutes of speech at 307 syllables per minute. It's 2,917 words long, using 974 different words. Difficulty: Advanced, Level 231 — it suits Advanced learners: knowing the common words through Level 231 covers about 95% of its words, roughly 1 unfamiliar word in 20. Words to learn first include 的, 在, 是.