当泵设计制造完成后，在使用中若发现有设计缺陷与不足，再调整则较为困难。
When the pump after the completion of the design and manufacture, in use in case of any possible design flaws and shortcomings, and then the adjustment is more difficult.
定做运动鞋在很多运动鞋网站上都能找到，但要找到时装鞋则较为困难，尽管不是没有可能。
While customized sneakers are available on many athletic shoe Web sites, fashion shoes are harder, although not impossible, to find.
组合导航系统易于完成突变型故障的检测与容错，对渐变型故障的检测与容错则较为困难。
It is relatively easy for integrated navigation system to accomplish the abrupt changing fault detection and fault tolerating, as for gradual changing fault it is rather difficult.
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