钓鱼者买了些红虫作为明天的鱼饵。

The angler bought some ___bloodworms to use as bait for tomorrow's fishing.

渔民经常用血虫作为鱼饵，因为它们在缺氧的水中也能存活。

Anglers often use ___bloodworms as bait since they can survive in oxygen-depleted water.