Polysubstituted
多取代的
🗣️ 情景例句
The trouble is
问题是
Nature is the glass reflecting truth.
大自然是反应真理的一面镜子。
He picked up what seemed to be the smallest bottle and discreetly asked the price.
他挑出一个看上去最小的瓶子，谨慎地问了价。