Quasiconvexity
拟凸性
🗣️ 情景例句
Good-bye.
再见。
It's least valuable.
这最没有价值。
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；