tortoise /ˈtɔ:təs/ n. ( pl.加-s,集体名词不变)(乌)龟：hare and tortoise 龟兔(赛跑)；tortoise-shell龟甲The tortoise spends the winter months in hibernation.乌龟在冬眠中度过寒冬季节。The tortoise wins the race while the hare is sleeping.兔子正睡觉时,乌龟赢得了比赛。