The children were fascinated by the ankylosaur fossil in the museum with its hammer-like tail.

ankylosaur 是由希腊词根 ankylo-（意为"弯曲的、僵硬的"）和 saur（意为"蜥蜴"）组成的复合词，指"甲龙"，一种具有厚重骨板和锤状尾巴的恐龙。