Nucleochronometer
n. 核子年代学标准( 指用来衡量或确定核子年代学的标准化学元素或同位素)
🗣️ 情景例句
As a matter of fact,
事实上，
It was after dark when we got back,and we were all tired.
我们回来时天已经黑了，并且我们都很疲倦。
A wet road is usually slippery.
潮湿的路往往是滑的。