Vinylmethylketone

丁烯酮

??? 情景例句

The little boy held his mother's hand firmly when crossing the street.
那小男孩過馬路時緊抓著母親的手。
By doing we learn.
經一事,長一智。
We also played games on the sand.
我們還在沙灘上做游戲呢。
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