Dihydroxy-
二羟基
🗣️ 情景例句
Have you ever held a secretarial position?
你曾当过秘书吗？
Call me tomorrow if you have time.
明天要有时间就给我打个电话。
It seems that man was making a real effort to understand the seasons 20,000 years earlier than has been supposed.
看来人类早就致力于探索四季变迁了，比人们想像的要早20，000年。