The bathtub/water closet is dirty.

浴缸/抽水马桶是脏的。

The bathtub is dirty. The water closet is dirty.

浴缸是脏的。抽水马桶是脏的。

The child is too small, can not own the water closet.

孩子太小，不可能自己坐厕的。

The water closet is blocked when I flashed it was overflowed.

抽水马桶堵住了，我一冲水水就冒出来了。

The carriages were so crowded that he had to stand close to a water closet.

火车上很挤，他只好站在厕所旁。