But it's actually an egg from a bullhead shark.

但它确实是由一种宽纹虎鲨产下的蛋。

This dreadful threat had the desired effect, and through the two remaining fields the three pair of small legs trotted on without any serious interruption, notwithstanding a small pond full of tadpoles, alias " bullheads, " which the lads looked at wistfully.

这种可怕的威胁产生了预期的效果，三对小腿在剩下的两块田地里小跑着，没有受到任何严重的干扰，尽管有一个小池塘，里面满是蝌蚪，别名“牛头”，小伙子们若有所思地看着。