航天飞机发动机内的这三个阀门不断被更换，以确保它们是最有效的，能保障飞行的安全。
The three valves in the shuttle's engine compartment kept being replaced to ensure they were the best available and safe to fly.
劳斯莱斯公司通过长期测评其全球喷气式发动机的工作情况，可以预测发动机在什么时候更有可能出现故障，从而安排顾客更换发动机。
By continuously dassessing the performance of its jet engines around the world, Rolls-Royce is able to predict when engines become more likely to fail so that customers can schedule engine changes.
遍布广泛的加油站为汽油发动机提供了安全保障，可为何就不能兴建新设施为汽车更换电池呢？
Instead of a petrol engine, with its widespread infrastructure of filling stations providing the security blanket, why not build new infrastructure to refuel cars with new, fully charged batteries?
如果发动机漏油，则让一个汽车技工更换掉所有有问题的垫圈和盖子。
If there is a leak, have an auto mechanic replace any problematic gaskets or oil seals.
它包括70个主要部件和子系统的改进或更换，包括通用公司CF 6- 80c2商用发动机的安装。
It includes 70 enhancements or replacements of major components and subsystems, including the installation of GE CF6-80C2 commercial engines.
周一的召回声明全世界270,000辆雷克·萨斯将更换气门弹簧，这是一个发动机的至关重要的组件，其在某些型号存在瑕疵并可引起熄火。
The recall announced Monday of 270,000 Lexus vehicles worldwide will replace valve springs, a crucial engine component, that are flawed and could cause stalling in some models.
通过新发动机节省的操作和维护成本就能完成联合STARS机型所有发动机的更换。
Replacing all of the engines in the Joint STARS fleet will pay for itself through the reduced operation and maintenance costs of the current engines.
新式的四缸发动机要比老式的双杠发动机更重，因此如果你（或者之前的船主）更换了舷外发动机，你需要确定支撑臂仍然合适。
Newer four-strokes are heavier than older two-strokes, so if you (or the previous owner) replace the outboard, you need to make sure the bracket is still appropriate.
他们同时预计到2020年，五分之三的汽车需要更换传统的内燃发动机。
They also estimate that by 2020, three-fifths of cars will need to use alternatives to the traditional internal combustion engine.
机油必须经过过滤，保持清洁，因为当发动机运行时有许多脏的颗粒进入机油，因此，机油滤清器必须有规律地更换。
Oil must be filtered and cleaned constantly since there are some dirt particles getting into the oil when the engine runs. Therefore, the oil filter must be regularly changed.
而且，常常是当它们堵塞并危及到发动机正常工作时，才会受到亡羊补牢般的更换维护。
And when they were blocked, often is the normal work and endanger the engine, the change will be better.
尤其汽车在多尘的道路上行驶时，情况确实如此。更换机油便可排除灰尘，使其不能损坏发动机。
This is particularly true when the car operates in dusty areas, changing oil flushes this dust out so that it cannot harm the engine.
同时需要检查防冻液的冰点，如果低冰点需要及时更换，以避免在寒冷的冬季冻裂缸，发动机损坏。
Also need to check antifreeze freezing point, if low freezing point needs to be changed in time, in order to avoid in the cold winter Donglie cylinder, engine damage.
为了避免发动机过早的磨损(非正常)和保持最佳的工作状态，对空气滤清器和压力调节阀pcv进行定期的检查和更换便显得至关重要了。
In order to avoid premature wear engine (abnormal) and maintain the best working condition, the air filter and pressure regulator PCV regular inspection and replacement is crucial.
在行驶了一定的里程后，发动机被拆下检修，这正是维修更换活塞环的机会。
If an engine is torn down for overhaul after considerable mileage, the chances are that the rings will require replacement.
负责试验过程中的部件更换，发动机调整，故障排除及相关服务。
Respond to the service, component change, adjustment of engine and troubleshooting during the test period.
研究了在外场更换和修理某型涡扇发动机各级风扇叶片的技术。
The field replacing and repairing technologies of various stages fan blades for an turbofan engine were studied.
车辆发动机每年在换季时都需要更换不同牌号的机油。
The engine oils of different trademark need to be changed in the new season of every year.
将发动机的转速稳定在3000转左右，不断地更换CD曲目，并细心聆听高音部分，听听是否有噪音即v。
B. the engine speed to stabilize at around 3000 RPM, constantly changing CD tracks, and listened carefully to the treble part, see if there are any noise i. e.
谨慎期过后本来是不需要及时更换机油的，但如果过了谨慎期还没有完成磨合期之间就更换一次高质量的机油，对发动机是非常有好处的。
After careful period would not need to change in time the oil, but if after careful period has not finished then change between persevered through a high-lever quality oil, the engine is very good.
谨慎期过后本来是不需要及时更换机油的，但如果过了谨慎期还没有完成磨合期之间就更换一次高质量的机油，对发动机是非常有好处的。
After careful period would not need to change in time the oil, but if after careful period has not finished then change between persevered through a high-lever quality oil, the engine is very good.
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