He tried to camouflage his real intentions by talking about friendship and so on.

他大谈友谊之类话,以此来掩饰他真图。

She couldn’t answer the question, so she tried to put up a smokescreen by talking angrily about the interviewer’s rudeness.

她答不问题，于是就生气地评论起采访者无礼，以此做掩护。