Astm
[化] 美国材料试验学会
🗣️ 情景例句
He gives his harness bells a shake
摇动， 绳上的铃铛
I'm going to show him how to speak Spanish.
我正要指点他如何讲西班牙语。
How long have you been at this school?
你到这学校有多么时间了？