be alone with: 单独
I couldn't imagine why he would want to be alone with me.
我想象不出为什么他会想和我独处。
You don't have to be alone with him and I don't think you ought to be.
你不必单独跟他呆在一起，而且我认为你也不该这样。

flesh and blood: 亲人，亲骨肉
I must help her. After all, she's my own flesh and blood.
我必须帮助她. 她毕竟是我的亲人.
While toward his very attractive flesh - and - blood wife in the next room he was numb.
与此同时,虽然他那漂亮妻子的血肉之躯就在隔壁房间,他却丝毫无动于衷.