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虾为什么倒着走呢
更新时间: 2020-09-22 00:00:00  

虾游泳和鱼大不相同,鱼摆动尾鳍就可以向前游动了,而虾没有鱼那样的尾鳍,只有一个尾巴和许多小腿,尽管如此,虾还是游泳的能手,能用腿做长距离游泳,它游泳时那些游泳足像木桨一样频频整齐地向后划水,身体就能徐徐向前驱动,当其受惊吓时,它的腹部敏捷地屈伸,尾部向下前方划水,能连续向后跃动,速度十分快捷,也有的虾不善于游泳,而大龙虾多数时间在海底的沙石上爬行。

关键词: 为什么

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