從奈米微塵到化學氣體， HEPA 與活性碳如何聯手打造純淨空氣？

YouTube · PanSci · Native everyday · 2026/04/02

2026/04/02

Speech duration: 11min 3s
Unique characters · 285 once: 742
Word count: 2,192
Average sentence length: 9.4
Length: 11:24
Unique words · 505 once: 844
Syllables per minute: 312
Script: Traditional 繁
Sentences: 368
Difficulty Beyond ranked vocabularydifficulty Many of this content's words are outside our ranked vocabulary list — specialised terms or name-like words — so no level reaches 95% word coverage. How difficulty works: Beyond ranked vocabulary

Many of this content's words are outside our ranked vocabulary list — specialised terms or name-like words — so no level reaches 95% word coverage.

TAGSNative everydayScience

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Vocab coverage

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

Lv 10

Lv 73

Beyond

TOCFL coverage

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

TOCFL 1 37%
TOCFL 2 7%
TOCFL 3 5%
TOCFL 4 9%
TOCFL 5 8%
TOCFL 6 7%
TOCFL 7 2%
Not on TOCFL 24%

Cumulative: TOCFL 1–4 covers 58% of the words, TOCFL 1–6 covers 73%, TOCFL 1–7 covers 76%.

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 725 words to reach 95% of this video’s words.

The 20 most-used of these 725 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	155	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]	50	Lv 1
濾網	lǜ wǎng	filter; a sieve	37	Unranked
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)	36	Lv 1
空氣	kōng qì	air; atmosphere	30	Lv 21
也	yě	also; too; as well; (not ...) either; (used after a verbal or nominal expression X to indicate that X is an extreme or unexpected case) even (X); (literary) particle having functions similar to 啊[a5]; surname Ye	20	Lv 1
中	zhōng	within; among; in; middle; center; while (doing sth); during; (dialect) OK; all right; to hit (a target); to be struck by (a bullet, illness etc); to win (a prize or lottery); (bound form) China; Chinese; surname Zhong	19	Lv 2
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	17	Lv 1
你	nǐ	you (informal, as opposed to courteous 您[nin2]); you (Note: In Taiwan, 妳 is used to address females, but in mainland China, it is not commonly used. Instead, 你 is used to address both males and females.)	17	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 ...	17	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	17	Lv 1
活性	huó xìng	(chemistry) activity; active; activated	17	Lv 137
碳	tàn	carbon (chemistry)	17	Lv 76
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)	16	Lv 1
像	xiàng	to resemble; to be like; to look as if; such as; appearance; image; portrait; image under a mapping (math.)	15	Lv 2
能	néng	can; to be able to; might possibly; ability; (physics) energy; surname Neng	15	Lv 1
不	bù	no; not so; (bound form) not; un-	14	Lv 1
面積	miàn jī	area (of a floor, piece of land etc); surface area; tract of land	14	Lv 105
有	yǒu	to have; there is; (bound form) having; with; -ful; -ed; -al (as in 有意[you3 yi4] intentional)	13	Lv 1
一樣	yī yàng	same; like; equal to; the same as; just like	12	Lv 2

Is this video right for my Chinese?

An 11-minute video from PanSci with 11 minutes of speech at 312 syllables per minute. It's 2,192 words long, using 844 different words. Difficulty: Beyond ranked vocabulary — many of its words are outside our ranked vocabulary list, so no level reaches 95% word coverage. Words to learn first include 的, 是, 濾網.