1.Estimated useful life by aircraft, of which some of the aircraft should have been scrapped, but the FAA did not know.
按飞机使用年限推算，其中，有些飞机应当现已报废，但联邦航空局并不知情。
2.Proper selection of the die material and of the die manufacturing technique determines, to a large extent, the useful life of forging dies.
能否恰当的选择铸型材料和铸型生产工艺很大程度上取决于锻模的使用寿命。
3.The portion of an asset's cost expected to be recovered through sale or trade-in of the asset at the end of its useful life.
是资产成本的一部分价值，这一部分价值等于预计在资产使用寿命结束，并将资产销售或处置后可以收回的金额。
4.Encouraged, began to believe that she will eventually become a useful life.
鼓舞，开始相信她最终也会成为一个有用的人生活下去。
5.The cost of the patent is amortized over the useful life of the patent, which may or may not coincide with the patent's legal life.
专利权的成本在其使用期限内摊销，但使用期限未必与法定有效期相吻合。
6.Depreciation is calculated and deducted from most of these assets, which represents the economic cost of the asset over its useful life.
折旧是根据大部分这些资产进行计算并扣除，表示这些资产在其使用年限内的经济成本。
7.The tips below show how you as a driver can support the engine oil in its many tasks and thus increase the useful life of the engine.
下面的要点，表明你作为一个司机如何需要执行多种任务的发动机油，从而提高了发动机的使用寿命。
8.Remember that the aim of a good school is to teach you to live a full and useful life and not merely to pass an examination.
记住，一所好的学校是要教会你过一种充实而又有意义的生活，不仅仅是通过考试。
9.Useful life of an appropriate amount of time the physical and mental health.
适量的业余生活有益身心健康。
10.An improved method for predicting the remaining useful life of transmission oil and an apparatus for practicing the same are provided.
提供一种用于确定润滑油的剩余使用寿命的改进方法和实施该方法的装置。