Well, a human, one of your legs works like two legs of a trotting dog, or works like three legs, together as one, of a trotting insect, or four legs as one of a trotting crab.
人間の１本の脚の働きは 犬の２本の脚を統合したもの 昆虫の３本の脚 カニの４本の脚と同じ働きをします