cloud和rain可数吗

　　Fog and low cloud cover are expected this afternoon.

　　预计今天下午有雾和低空云层。

　　The city is covered by a foul-smelling cloud of smoke.

　　城市被一团恶臭的烟云笼罩着。

　　The moon was fuller than the night before, but the light was diffused by cloud.

　　月亮比头一天晚上更圆，但因云层遮掩而月光朦胧。

　　The Sun, Moon, and the planets formed from a huge spinning gas cloud that collapsed into a gyrating disc.

　　太阳、月亮和这些星球形成于倒塌进一个旋转盘状物的一团巨大旋转汽云。