针对前一种情况，主要是注意工作段内有没有空气，解决方法同上。

In the former case, mainly pay attention to work in period without air, the solution as above.

youdao

针对前一种情况，主要是注意工作段内有没有空气，解决方法同上。

In the former case, mainly pay attention to work in period without air, the solution as above.

youdao