Etheride
酰卤化物
🗣️ 情景例句
Uh-oh.
啊哈。
The first step is the only difficulty.
万事起头难。
Could you ask him to ring me, please? My number is 181 584 9662.
麻烦你请他给我打个电话来，我的号码是181 584 9662。