It looks like hard work.It looks like hard work,but hopping actually lets the kangaroo conserve more energy than another animal could when running on four legs.俄．．一道旧托听力．．我听得是 哈平 ．．可是答案是hopping．．
问题描述：
It looks like hard work.
It looks like hard work,but hopping actually lets the kangaroo conserve more energy than another animal could when running on four legs.
俄．．一道旧托听力．．我听得是 哈平 ．．可是答案是hopping．．
答
这看上去是十分困难的事,但是跳跃实际上使袋鼠在四足跑时比其他动物节省了更多能量