Because the flippers are comparatively thin and blade-like, they are the one part of the leatherback that is likely to become chilled.
棱皮龟的脚蹼比较薄并且呈刀片状，因此，它们就是棱皮龟身体中有可能被冻住的部位。
2
Last minute our diver was still swimming in the Pacific with flippers, and the next minute he was doing a breaststroke in a fire bucket 300 feet in the air.