"Dad replied," just down the earthworms have a kind of smell, fish smelled the odor will know that there are food, can swim by... "just when it comes to this, there is a fish bait."

爸爸回答道：“刚放下去的蚯蚓有一种气味，鱼闻到了这种气味就知道这边有食物，就会游过来……”刚说到这，就有一条鱼上钩了。