Mainlines
n. 主线；静脉注射\\nvt. 把海洛因等毒品直接注入静脉\\nvi. 沉溺于；注入\\na. 主流的；沿干线的；传统的
🗣️ 情景例句
Oh, how do you do, Xiao Fu. This is Mary.
哦，你好，小付。我是Mary。
I ought to talk to him.
我应该和他商讨。
A sound made by tapping on the hull of a ship will be reflected from the sea bottom,
敲打船体所发了的声音会从海底传回来，