Plausibly, one of the aims of science is knowledge of laws of nature. But, intuitively, there is something wrong with the view that laws of nature are merely Humean uniformities - since there are lots of HUs that are not laws. For instance suppose that all my friends just happen to have brown hair.
Properties are features which different objects can share.
And this doesn't seem to count as an adequate explanation. NRT seems pretty implausible. The answer lies in the thought that we ought not to believe in what we could not possibly experience. So we ought not to believe in them. So the idea is something like this.