cloud可数吗

例句：

1、a cloud of chaff, for decoying radar-guided missiles

迷惑雷达制导导弹的`干扰云

2、The scandals still cloud MCI's reputation.

这则丑闻仍然损害着微波通信公司的声誉。

3、The night was dark, the stars hidden behind cloud.

那个夜晚很黑，星星躲在云后面。

4、Another cloud of witnesses compasses me about.

又一群目击者把我围了起来。

5、The American edition of `Cloud Street' is already in its third printing.

美国版《云街》已是第三次印刷了。