Pyridylidene
吡啶亚基
🗣️ 情景例句
Philip was a young doctor,
Philip当时是个年轻的大夫
Do you often learn geography on the weekend?
你常常在周末学地理吗？
there is no evidence that the total amount of activity is any less.
但没有迹象表明，其活动总量有任何减少。