loading and unloading

例句：

1. 1. The ship was loading cargo onto the dock.
   这艘船正在将货物装到码头上。
2. 2. Unloading is a dangerous task that requires special equipment.
   卸载是一项危险的任务，需要特殊的设备。
3. 3. The port is designed to handle both loading and unloading operations efficiently.
   这个港口设计用来高效地处理装卸作业。