The wall and the one - way mirror are sound proof so observers can discuss design ideas in a normal tone without disturbing the participant 墙和单面镜是隔音的,于是,观察者可以以正常语调讨论设计想法而不打扰参与者
2.
Practicing as loudly as possible builds your confidence and lets you speak in a natural and normal tone when speaking instead of a shy whisper 最大声地操练能建立你的自信心,让你用自然和正常的语调讲话,而不是害羞地轻声说。