坦克部队释放烟幕来掩护他们的前进。

The tank unit released a ___smokescreen to cover their advance.

公司发布的声明只是一个烟幕弹，试图掩盖他们削减员工福利的真实意图。

The company's statement was just a ___smokescreen to hide their real intention of cutting employee benefits.