便所

例句：

1. 1. Please use the restroom before leaving the building.
   请在使用完洗手间后离开大楼。
2. 2. The restroom is located on the second floor.
   洗手间位于二楼。
3. 3. I need to use the restroom before lunch.
   午餐前我需要去洗手间。