These masks are usually very comfortable on the face . But their straps go behind the head and not around the ears, which is less practical for many users.

这些口罩佩戴起来通常很舒服，但是带子是箍在头上，而不是耳戴式，所以对有些人来说不是很好用。

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They also may have pain in the head or behind their eyes.

VOA: special.2009.05.26

I should tell you first of all that in this class, the taping is not going to affect you because the camera is going to be behind your head.

我想跟你们强调的是,录像将不会影响你们,因为摄像机在你身后

耶鲁公开课 - 基础物理课程节选

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