我在清澈的小溪里看到一群长着锋利刺的小刺鱼游过。

I saw a school of small ___sticklebacks with sharp spines swimming in the clear stream.

雄性刺鱼会用植物搭建精致的巢穴来吸引配偶。

The male ___stickleback builds a delicate nest from plants to attract a mate.