[countable] ananimalthathasahardshellandmovesveryslowly. Aturtlecanpullitsheadandlegsintoitsshelltoprotectthem.龟➨ WHICH WORD?词语辨析Turtle or tortoise? * turtle 还是 tortoise?In scientific language, tortoise is used for the animals that live on land, and turtle is used only for the animals that live mainly in water. However, most people usually use turtle for both types of animals.在科学用语里,tortoise 指生活在陆地上的乌龟,而 turtle 则仅用来指海龟,但很多人把两种动物都用 turtle 来表示。