And if you make a mistake in the middle of a long expression, you have to start all over.

如果在输入一个长表达式中出了错，就得全部重来。

youdao

And if you make a mistake in the middle of a long expression, you have to start all over.

如果在输入一个长表达式中出了错，就得全部重来。

youdao