It is a method of contact during emergency situations.

它是一种紧急状况下的联系方法。

youdao

It is simple, an important method of contact during emergency situations.

在紧急状况时，它是一种简单又重要的联络方式。

youdao

It is simple, an important method of contact during emergency situations.

在紧急状况时，它是一种简单又重要的联络方式。

youdao