这个节目用隐藏摄像机拍下了人们在电梯里唱歌时的真实反应。

The program used a ___candid camera to record people's genuine reactions when singing in an elevator.

这个节目使用隐藏摄像机拍摄人们在意外情况下的真实反应。

The show uses ___candid-camera footage to capture people's genuine reactions in unexpected situations.