onprep.在 ... 之上；由 ... 支撑着；在（某一天）；关于；基于adv.穿着；向前（移动)；表示持续性adj.表示已连接、处于工作状态或使用中；发生；值班Onjin翁欣

1. The empire was on the wane after its period of prosperity.
   帝国经过全盛以后逐渐衰落。
2. By now the power of the Roman Empire was on the wane.
   到这时，罗马帝国已日益衰败。
3. Most of these new jobs pay less than regular jobs, and few come with good benefits. The standard American job, with a40-hour workweek, medical benefits and a pension at age65, is on the wane.
   这些新工作(机会)多半待遇不如正式工作，并且福利优厚的不多。每周40小时，有医疗保险，并且65岁可领退休金的标准美国工作越来越少。