Recently the safety of school buses has become an increasingly serious problem.

近期校车安全问题成为了一个日益严重的问题。

youdao

The safety in school is one of the most important problem now.

校园安全是目前最重要的问题之一。

youdao

The safety in school is one of the most important problem now.

校园安全是目前最重要的问题之一。

youdao