has come from a single invention made less than 140 years ago. 是由一项历史还不到一百四十年的发明引起的
With less time spent looking for food,there is more time for play. 觅食时间缩短 使得他们有更多时间可以玩耍
It covers less than 6% of the Earth's surface 它仅占地球表面积的百分之六
there is less and less space for wildlife, 野生动植物的生存空间日益减少
provide their young with a rather less precarious start in life. 小鸟的幼年过得安全一些
now, less than three percent of that number remains. 现在,只有不足9000头
Once started the foot long flowers can open fully in less than a minute. 长长的花可以在1分钟之内完全展开…
They're pygmy sea horses, the world's smallest, less than two centimeters high. 豆丁海马--全世界最小的海马,身长不到两公分
means jungle frogs are less tied to puddles and pools 使得树蛙可以摆脱水塘的束缚