Isotopism
同位素性
🗣️ 情景例句
A community center
一个社区中心
A chain is no stronger than its weakest link.
链条的坚固程度取决于它最薄弱的环节。
Sure enough, Rastus arrived punctually at seven o'clock that evening.
果然，当天晚上7点正，拉斯特斯准时回来了。