Around the inkstone there is a circle of double lip mouth.
外有一圈子母口,既可护墨,又可承盖.
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Standard versions feature a nitrile double - lip seal and standard grease.
标准版本采用腈双密封唇和标准油脂.
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If seated, I play double lip, period.
坐下时, 我就用双包演奏.
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When I have to march, double lip feels too unstable for comforts sake.
当在军乐队作行进演奏时, 双包可能造成乐器不固定.
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