“smoke screen”字面上翻译过来就是“烟幕”，引申为烟雾弹；障眼法；幌子。

【例句】
The rumors were a smoke screen for their own illegal activities.
这些谣言是他们为掩饰自己的非法活动所放出的烟幕弹。

The FTC will not be smoke screen for tobacco companies'shameful marketing practices.
联邦贸易委员会不会包庇烟草公司可耻的市场营销行为。