Isomers
同分异构体
🗣️ 情景例句
because we have a little surprise for you today.
因为今天我们要给各位一项惊喜。
What shall I give him for his Easter?
我要给他什么东西作为复活节礼物？
George showed me to the guestroom which, he said, was rarely used.
乔治把我领进客房，说这间很少使用。