我在公园里发现一只刺猬正蜷缩成一团睡觉。

I found a ___hedgehog sleeping curled into a ball in the park.

军队采用刺猬阵型，所有方向的尖刺都能有效抵御敌军进攻。

The troops formed a ___hedgehog defense, with spikes facing outward to counter attacks from any direction.