UNITRn.联合国调查训练研究所unitn.单元；单位；部件；组件unit of fire弹药基数unit package最小单位包装Unit booster单元增压器unit's placeunit comment机组组合unit summary单元总结unit annuity基数年金unit casting单一铸件unit of coal单位煤量unit testing单位测试,单元测试

1. In the concept of a million years of history as a unit deduce the endless cycle of life as a short Zhaolu.
   在玛雅人的观念中，历史是以千万年为单位推演的无尽轮回，人生短暂如同朝露。
2. The land development fee may be calculated and collected by the land development unit in a lump-sum, or by yearly installments.
   土地开发费可由土地开发单位一次性计收或者分年计收。