Now you know it

But now you know it is hard to change his nature.

现在你知道他本性难移了吧。

Now, something had been happening there a little before, which I did not know anything about until a good many days afterwards, but I will tell you about it now.

不久以前这里发生过一件事，我直到好多天以后才知道，但现在我要把这件事告诉你。

You don't know how lucky it is, your turning up just now!

你不知道你现在来是多么幸运！