一旦我们察觉到什么异常，我们就应该立刻向学校保安处报告。

Once we smell out something unusual, we should report it to the campus guard immediately.

youdao

一旦我们察觉到什么异常，我们就应该立刻向学校保安处报告。

Once we smell out something unusual, we should report it to the campus guard immediately.

youdao