英语翻译让我们担心的是我们对事态的变化缺乏准备.（concern）孩子们没有在通常的放学时间回家,母亲很为他们的安全担心

英语翻译
让我们担心的是我们对事态的变化缺乏准备.（concern）
孩子们没有在通常的放学时间回家,母亲很为他们的安全担心.(concern)
所有参与了这件事情的人都对此事感到非常懊悔.(concern）

1.what concerns us is we are not prepared for the change of the state of affairs
2.the mother was concerned about her children's safety,because they didn't come home after school at the usual time.
3.all those who concerned themselves with this matter regretted it