Well, one simple way is to follow what John Mew calls the tropic premise: “Rest the tongue on the palate with the lips sealed and the teeth in light contact for four to eight hours a day.”
一个简单办法就是遵循 John Mew 所谓的“向性处所”：“将舌头顶在上颚，轻轻闭紧嘴唇和牙齿，每天4~8个小时。”
Lip seal
原声例句
WIL生活启示录
SciShow 合集
And the mucus has another function: It helps the fish’s lips seal shut around the lumpy coral, which helps it suck in one particularly tasty part: the polyps’ own mucus, plus some flesh chunks.
粘液还有另一个功能： 它帮助鱼的嘴唇密封住块状珊瑚，这有助于它吸入一个特别美味的部分： 珊瑚虫自己的粘液和一些肉块。
英语百科
Radial shaft seal
（重定向自Lip seal）
Radial shaft seals, also known as lip seals, are used to seal rotary elements, such as a shaft or rotating bore. Common examples include strut seals, hydraulic pump seals, axle seals, power steering seals, and valve stem seals. Early radial shaft seals utilized rawhide as the sealing element, and many elastomeric seal companies today once were tanneries. The advent of modern elastomers replaced rawhide, industry also added a garter spring which helps the sealing lip compensate for lip wear and elastomer material changes.
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