它具有既方便又便宜的双重优点。

It has the double advantage of being both easy and cheap.

《牛津词典》

有了这支特别设计的笔，孩子们觉得学习起来既方便又有趣。

With the specially designed pen, kids find it convenient and fun to learn.

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如今对于我们来说骑共享自行车是既方便又便宜。

Nowadays, it's convenient and cheap for us to ride a shared-bicycle.

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So when you go ahead and draw these on your problem-sets or on your exams, it's a good idea to put these dashed lines in, both for you and for people reading it to see exactly where your molecular orbitals are coming from.

所以当你在做课后题,或者考试的时候要画这些图时，最好把这些虚线放进去，既方便你自己也方便别人知道,这些分子轨道是从哪里来的。

麻省理工公开课 - 化学原理课程节选