Diazoparaffins
重氮烷(属烃)
🗣️ 情景例句
Growing up without a mother is difficult.
在没有母亲的情况下长大不简单。
What's this?
这是什么？
An electric razor that meets the European Union's safety standards must be approved by American testers before it can be sold in the United States,
一把符合欧洲联盟安全标准的电动剃须刀必须得到美国检测人员的认可，方可在美国市场上销售；