Piperonal(dehyde)
[化] 胡椒醛
🗣️ 情景例句
I'm not convinced.
我持保留态度。
By the time we got there,the play had already begun.
等我们到那里，戏已经开始了。
I want to improve, but I don't know how.
我想提高它，但又不知道怎么样才能提高。