| 摘要 |
A mouthpiece for use with a breathing device has a pliable lip flange which fits between the lips and teeth of the user and a pair of bite lugs which extend from the lip flange between the user's teeth and wherein the upper and lower bite surfaces of the lugs are constituted by a plurality of resilient projections which are individually compressed by the teeth of the diver as he bites down on the lugs.
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