该隔音口罩不仅可以有效防止用户的话音 向外传播，而且构造简单，易于使用。
The sound-insulation mouth mask not only effectively prevents the voice of a user from spreading out, but also has simple structure and is easy to use.
该隔音口罩不仅可以有效防止用户的话音 向外传播，而且构造简单，易于使用。
The sound-insulation mouth mask not only effectively prevents the voice of a user from spreading out, but also has simple structure and is easy to use.
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