A pall of oily black smoke drifted over the cliff-top.

一股漆黑的烟雾飘过了崖顶。

《柯林斯英汉双解大词典》

In the image, Moscow is hidden under a pall of smoke.

在图片中我们可以看到，整个莫斯科都笼罩在浓烟之中。

youdao

None wore face masks, despite a pall of silica dust in the air, and some said they had not showered in years.

尽管空气中到处漂浮着粉尘和沙土，但他们没有一个人戴有防护面具，其中有一些人还说他们已经几年没洗过澡了。

youdao

The Obama administration says it counseled the Karzai government against allowing the return of General Dostum, whose reputation threatens to cast a pall over the country's critical election process to which the United States has lent heavy support.

VOA: standard.2009.08.17

The combined pall of looming cuts and month-to-month budgeting has frozen the civilian defense industry.

NPR: US Economy Hamstrung By Washington's Brinksmanship

Soon there was a thick black pall of smoke hanging low over the apartment blocks and minarets.

BBC: NEWS | Middle East | Gaza mourns symbol of struggle

Impossible to value this one and many other private companies in her portfolio, given the pall of darkness over finances and precise ownership.

FORBES: Lynn Tilton: Is She Really A Billionaire?