但自上世纪九十年代以来，她们的预期寿命全球排名一直在下滑。
But their international ranking has been falling since the nineteen nineties.
自上世纪 90年代以来 ，单分子检测已经取得了巨大的进步。
Single molecule detection has made a tremendous development since 1990's.
自上世纪80年代以来，人力资源管理一直是十分重要的。
Since 1980s, human resources management have been very important.
自上世纪80年代以来，人力资源管理一直是十分重要的。
Since 1980s, human resources management have been very important.
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