You have undertaken to do something; all I remark upon that at present is, do it! '

您已承诺做某事； 我现在唯一的评论就是， 去做吧！

Her training had all been toward the end of making her proficient in what she had undertaken to do.

她的训练一直是为了让她精通她承诺要做的事情。

The people at the inn will undertake to do this: and I can trust to you to see it done, I know.

旅店的人会承诺这样做：我可以相信你会看到它完成，我知道。

I'm not bound to deliver a lecture on my family affairs, I have not undertaken to do it, and I'm not a going to do it.

我没有义务就我的家庭事务发表演讲，我没有承诺这样做，我也不会这样做。