A kangaroo cannot jump if its tail is lifted off the ground. It needs its tail for pushing off.

　　如果袋鼠的尾巴离开地面，袋鼠就跳不起来。它要靠尾巴推动才能离开地面。


　　According to tests made at the Institute for the Study of Animal Problems in Washington, D.C., dogs and cats, like people, are either right-handed or left-handed----that is, these animals favor either their right or left paws.

　　华盛顿特区动物问题研究所的试验表明，狗和猫象人一样，也有右撇子和左撇子----即有些喜欢用右爪，有些喜欢用左爪。

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