在河边钓鱼时，我们小心地避开了一条盘踞在树根旁的棉口蛇。

While fishing by the river, we carefully avoided a ___cottonmouth coiled near the tree roots.

这种药让我口干，所以我总是随身带着水瓶。

This medication gives me ___cottonmouth, so I keep a water bottle with me all the time.