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

但它确实是由一种宽纹虎鲨产下。

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.

这种可怕威胁产生了预期果，三对小腿在剩下两块田地里小跑着，有到任何严重干扰，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。