爱玩的小猪2007
cloud是名词，不能充当形容词。它的形容词是cloudy，多云的。比如，It's cloudy today. 今天多云。cloudless也是形容词，但它是无云的意思。less之所以加在cloud后面，是因为cloudyless不符合构词法，后缀+在y后面读得不通顺。
晰晰沥沥
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。
If it had hit the Earth, it would have made a crater 100 miles across and thrown up an immense cloud of dust.
如果它撞上了地球，就会砸出一个100英里宽的大坑并扬起巨大的尘埃云团。
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