Cycloalknes

[建] 環(huán)烷

??? 情景例句

If I have time, I enjoy camping in the wild with my friends.
若時間許可,我愛和朋友到野外露營。
No one can call back yesterday;Yesterday will not be called again.
昨日不復來。
But we still have a problem.
不過我們還是有問題呀。
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?? 更多 C 開頭的單詞

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