So when did canned laughter and fake yuks emerge? And why?

那么，预录笑声和假笑声是什么时候出现的？又为什么会出现呢？

Garry watched a comedy show on his tablet, snorting alongside the canned laughter, his chin resting on his chest.

加里在他的平板电脑上看了一场喜剧节目， 伴随着罐装笑声喷着鼻息，他的下巴搁在胸前。