Sentence Examples with the word draw the line

It must be borne in mind that the exact nutritive relations of the two constituents of the lichen have not been completely elucidated, and that it is very difficult to draw the line between symbiosis and parasitism.

In the new world no southern barriers existed and it is more difficult to draw the line between contiguous sub-regions.

It's a pain that I have to ask the voters for it, but I draw the line at the water fight.