从母亲严肃的脸，孩子们知道了事情的严重性。

From the serious face of their mother, the children knew the seriousness of the matter.

youdao

从母亲严肃的脸，孩子们知道了事情的严重性。

From the serious face of their mother, the children knew the seriousness of the matter.

youdao