云朵是可数名词吗?

　　Her father's illness cast a cloud over her wedding day.

　　她父亲的病给她的结婚喜庆日蒙上了一层阴影。

　　His last years were clouded by financial worries.

　　由于经济窘困，他的晚年生活过得闷闷不乐。

　　He still has a cloud of suspicion hanging over him.

　　大家仍然在怀疑他。