立彬の日本語

水素はそれ自体としては自然界に存在しない。

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Hydrogen does not exist as such in nature.
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水素， すいそ
1. hydrogen (H)
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それ自体， 其れ自体， それじたい
1. in itself, the thing itself, this itself, for its own sake, per se
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としては， としちゃ， としちゃあ
1. as (for), for, in the capacity of
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自然界， しぜんかい
1. nature, the natural world, realm of nature
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存在， そんざい
1. existence, being, presence
存在。处于发生后尚未消亡的状态。
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は
は
1. indicates sentence topic 2. indicates contrast with another option (stated or unstated) 3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调
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に
に
1. at (place, time), in, on, during 2. to (direction, state), toward, into 3. for (purpose) 4. because of (reason), for, with 5. by, from 6. as (i.e. in the role of) 7. per, in, for, a (e.g. "once a month") 8. and, in addition to 9. if, although
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為る(する){しない}