a coloured substance, usually contained in a pencil, that is put around the edges of the lips before putting on lipstick (= colour for the lips), or the pencil itself

Lip liners are the key to keeping your lips looking fresh. 唇线笔是保持唇部妆容清爽的关键。

You can change the shape of your lips by clever use of lipliner. 你可以通过巧妙地使用唇线笔来改变嘴唇的形状。