dock bottom

例句：

1. 1.The dock is the first place where boats come in and out of the harbor.
   码头是船只进出港口的起始点。
2. 2. The dock was crowded with people waiting for their ships to arrive.
   码头上挤满了等待船只到来的人们。
3. 3. The dock workers were busy unloading cargo from the ships.
   码头工人正在忙碌地从船上卸载货物。