?? 詞語組成解析
乙醛
[化]一種三分子的縮合物
??? 情景例句
I recently broke up with my boyfriend. I was really bummed out.
最近我和男朋友分手了。我真沮喪。
I don't know how to work the machine.
我不懂得怎樣使這部機器運轉。
Where are you from?
你從哪兒來的？