A kangaroo cannot jump if its tail is lifted off the ground. It needs its tail for pushing off.
如果袋鼠的尾巴離開地面，袋鼠就跳不起來。它要靠尾巴推動才能離開地面。
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.
華盛頓特區(qū)動物問題研究所的試驗表明，狗和貓象人一樣，也有右撇子和左撇子——即有些喜歡用右爪，有些喜歡用左爪。
It is the female lion who does more than 90 percent of the hunting while the male is afraid to risk his life， or simply prefers to rest.
90%的食物由母獅獵取，雄獅則害怕用生命冒險或者只是喜歡休息。
There are no penguins at the North Pole. In fact， there are no penguins anywhere in the Northern Hemisphere except in zoos. All seventeen varieties of the bird are found below the equator， primarily in Antarctica.
北極沒有企鵝。事實上，北半球除了動物園里，任何地方都沒有企鵝。所有17種企鵝都在赤道以南，主要在南極洲。
Arctic terns found in North America and the Arctic migrate each year as far south as Antarctica and back， a round trip of over 18，000 miles. Theirs is probably the longest migration flight.
人們發(fā)現北美洲和北極地區(qū)的北極燕鷗每年一直要遷移到南極洲再飛回來，往返形成超過18，000英里。這也許是最遠的遷移飛行。