As part of a global programme , 89 ozone - depleting substances are under legislative control.此外, 又对89种消耗臭氧层的物质实施法例管制,以配合全球的行动.A class I substance is any chemical with an ozone - depleting potential of 0.2 or greater.I类别...
在进化的过程中, 一些鸟丧失了飞行能力.In the course of evolution, some birds have lost the power of flight.双腿直立行走的进化是原始人向人类进化的最初阶段中的一步.We think about the evolution of bipedalism as one of first events that led hominids down the path to be...
Sheila had an ulterior motive for trying to help Stan.希拉想帮助斯坦是另有所图的。Sheila had come to dinner in a black jersey top.希拉身着一件黑色针织上装来参加晚宴。Sheila was looking miserable.希拉看上去愁眉苦脸的。...