以前的很多时候，她就是通过在信封或者餐巾纸的背面画化学键的草图，向父母解释她在实验室里的工作。

And on many occasions, it was on the back of an envelope or on a napkin that she doodled sketches of the chemical bonds to better show her parents what she was working on in the lab.

youdao

以前的很多时候，她就是通过在信封或者餐巾纸的背面画化学键的草图，向父母解释她在实验室里的工作。

And on many occasions, it was on the back of an envelope or on a napkin that she doodled sketches of the chemical bonds to better show her parents what she was working on in the lab.

youdao