The mandibles are usually lost, the labrum is reduced to a narrow transverse sclerite, and the labium is a small flap ( though its palps retain quite large).
上颚消失,上唇退

条窄横片,
唇退

小片(
唇须发达)。
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量
男人决定去死 

量-伦勃朗·哈尔曼松·凡·莱因
平 The little princess talked incessantly, her short, downy upper lip continually and rapidly touching her rosy nether lip when necessary and drawing up again next moment when her face broke into a smile of glittering teeth and sparkling eyes.
小公爵夫人不停地说着话,她
嘴时而闭一
,那带着毫毛
短上唇稍稍触到鲜红
唇,接着嘴又张开,绽开闪耀着牙齿
目光
笑容。
英语教练 Stefanie
英语教练 Stefanie