Crabs have legs that bend sideways.
螃蟹的腿天生就是向外侧弯的。
So they can only walk from side to side.
所以它们只能横着走。
Their legs work like little hinges.
它们的腿像小铰链一样活动。
Walking sideways helps them hide in cracks.
横着走方便它们躲进石头缝里。
Crabs can move very fast this way.
这样走反而特别快。
A crab on the beach scuttles sideways.
海滩上的螃蟹都是横着跑的。
That is why crabs walk sideways.
这就是螃蟹横着走的原因。
