Topslicing
下行水平分层崩落采矿法
🗣️ 情景例句
How well do I speak English?
我的英文说得怎样？
You are saying you turn on the computer and see nothing?
你的意思是你把计算机打开后什么也看不见？
Can you ring up the bus company?
你能给汽车公司打个电话吗？