- Dunkleosteus has the pace to catch up with them.
邓氏鱼的速度能够追上菊石 - But the ammonoids boast a trick of their own...
但是菊石也有自己的本领 - ...jet propulsion.
喷射推进 - Just what it needs to outmaneuver the young fish.
刚好能够摆脱这条年轻的鱼 - As it starts to circle...
它开始绕圈 - the ammonoid does the same...
菊石也绕圈 - shielding its body with its shell.
用壳保护自己的身体