lap、leg和knee这三个词汇在含义和用法上有明显的区别。
lap:这个单词指的是“膝盖周围的部分”,也可以指“(书页等的)翻页”。例句:She tucked her skirt into her waistband so that it didn't trail over her lap.leg:这个单词指的是“腿”,是人体的一部分,从大腿到脚踝的整条腿。例句:She had to use crutches because she had broken her leg.knee:这个单词指的是“膝盖”,是人体的一部分,连接大腿骨和小腿骨的关节。例句:He couldn't bend his knee after the accident.综上所述,这三个单词在含义和用法上有明显的不同,可以根据语境进行区分和使用。