"让我们在乎他" 这个短语的直译是 "Let us care about him"，意思是让我们关心他，关注他。

这个短语来源于英文动词 "care"，意思是关心，在意。例如：

I really care about my family. (我真的很在乎我的家人。)
He doesn't seem to care about his grades. (他似乎不在乎他的成绩。)

下面是一些用 "让我们在乎他" 这个短语的例句，并附上中文翻译：

Let's not forget that he is still a human being. Let's care about him. (让我们不要忘记他仍然是一个人。让我们在乎他。)
I know you don't pke him, but please try to care about him a pttle. (我知道你不喜欢他，但请尽量在乎他一点。)
I know you're going through a tough time, but I want you to know that I care about you. (我知道你正在经历艰难的时期，但我想让你知道我在乎你。)