Piperonal(dehyde)
[化] 胡椒醛
🗣️ 情景例句
He had an emergency.
他有紧急事情。
Wade not in unknown water.
不知水的深浅，不可粗心趟水过河。
I think you probably know China has adopted a flexible policy in her foreign trade.
我想你也许已经了解到中国在对外贸易中采取了灵活的政策。