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使用寿命02:useful timeRelative explainations: The useful life of a car.汽车的使用寿命The useful life of the equipment depend mainly on the maintainability.设备的使用寿命主要取决于维修保养条件。It's only the gold mounting that pushes the price of this model up. For quality and length of service there's nothing to choose between this and the cheaper pen.然而就质量和使用寿命而言，这种钢笔和那种便宜些的没有多大差别。average life平均寿命mean lifetime平均寿命Use of a device or component at a lower current, voltage or power level than it can handle, in order to give longer life or reduce occurrence of stressrelated failures.使用比设备或元件可以承受的要小的电流、电压或功率，以便提高延长使用寿命或减少出现由于应力而产生的故障。The service life of a machine depends chiefly upon how it is being used.机器的寿命主要取决于它如何使用。Water is also used as a coolant for rolling- mill roll to maintain their contour and lengthen their service life.热轧机的轧辊也需用冷却水来保持轧辊的外形和延长它的使用寿命。catalyst life催化剂寿命engine life发动机寿命

便宜:[biànyí,piányi]1.inexpensive其它相关解释:例句与用法:1.现在的禽肉相当便宜。Poultryisrathercheapnow.2.她的那双鞋看上去很便宜。Hershoeslookcheap.3.【谚】便宜无好货。Thecheapbuyertakesbadmeat.4.【谚】不要的东西，再便宜也贵。Nothingischeapifyoudon'twantit.5.真骗人，饭食好像很便宜，可是吃菜还得另付钱呢。It'sarealsell:thefoodseemscheapbutyoupayextraforvegetables.6.乘长途汽车唯一可取之处就是旅费便宜.Thecheapnessofcoachtravelisitsonlyrecommendation.7.这个虽然不便宜,但我觉得我们还是应该买.It'snotcheapbutIthinkweshouldbuyitnonetheless.8.儿童的鞋并不便宜--反而更贵.Children'sshoesaren'tcheapquitethereverse.

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reductionofservicelife缩短使用寿命；使用寿命降低注：service英[ˈsɜ:vɪs]美[ˈsɜ:rvɪs]n.服役;服务，服侍;服务业;维修服务;vt.检修，维修;向…提供服务;保养;满足需要;adj.服务性的;耐用的;服现役的;[例句]britainstillboaststhecheapestpostalservice.英国仍拥有最便宜的邮政服务系统。[其他]第三人称单数：services复数：services现在分词：servicing过去式：serviced过去分词：serviced

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英语不同于汉语，是没有专门的量词的。在英语中，表达数量关系常常用一些名词词组，如a drop of … （一滴……），a piece of … (一片、段、块、张……)，many bags of … (许多袋……)等等。

◆ cheap; inexpensive:buy a thing cheap;东西买得便宜a cheap store;价格便宜的商店It is by no means cheap.并不便宜。Cheapest is the dearest.便宜没好货。This kind of car is inexpensive.这种汽车便宜。