1950年代后半期，过滤嘴香烟占50%的市场份额。
In late 1950s, filter tip cigarette makes 50% up market share.
自七十年代后半期以来。在国际经济力量对比中，巳发生某些有利于美国的新变化。
Since the latter half ofthe 1970s, changes that have taken place in the world economic balance are in favour ofthe United States.
西欧和日本自80年代后半期开始开展返回式卫星的研制，近些年来，获得了一些进展。
Western Europe and Japan set about their research and investigation in the second half of the 1980s, and have achieved considerable progress.
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