它不需要电池，它在生活中很常见，而且可以方便的放入口袋或钱包。

This simple little device requires no batteries, is totally customizable, and fits neatly in your pocket or purse.

youdao

它不需要电池，它在生活中很常见，而且可以方便的放入口袋或钱包。

This simple little device requires no batteries, is totally customizable, and fits neatly in your pocket or purse.

youdao