The old tried-and-true security drill is still the best, security experts say.

安全专家说，过去行之有效的安全演习仍是最好的办法。

youdao

The old tried-and-true security drill is still the best, security experts say.

安全专家说，过去行之有效的安全演习仍是最好的办法。

youdao