Once upon a time, this defense would have worked. 在过去 这种防御会有效果

282. As it starts to circle...
     它开始绕圈
283. the ammonoid does the same...
     菊石也绕圈
284. shielding its body with its shell.
     用壳保护自己的身体
285. Once upon a time, this defense would have worked.
     在过去 这种防御会有效果
286. But Dunkleosteus has a weapon its tiny ancestors did not.
     但是邓氏鱼 拥有自己微小祖先所没有的武器
287. Jaws.
     颌
288. It can bite down and crush its prey.
     它能咬住并咬碎猎物

来自《我们星球上的生命 第一季 第二集 Life on Our Planet S01E02 第一前线》第 285 行