Laevoisomer
左旋(同分)異構體
??? 情景例句
She wants to know
她想知道
I'm afraid I won't be able to come.
我恐怕不能來。
In 1898 a law was passed which meant that all people above a certain age were paid a weekly old-age pension.
1898年通過了一項法令，規定一定年齡以上的人全都可以按周領取"老年養老金。