You're right of course and it's a difficult line to tread.

Other times, she says, his father will have him write out a particularly difficult line 10 times to remember it.

There was a difficult line of play that would have saved the day.

Pass blocking against a difficult defensive line was very good.

In crafting the new proposal, the commission tried to walk a difficult line.

A particularly difficult line to construct (it cost the equivalent of 27 million pounds).

I think this is a difficult line to take on the issue.

In fact, that was the most difficult line I walked.

I think you have set yourself a new, very interesting, and difficult line of research.

Tatiana had been warned that here would be some difficult lines in her part.