Return mechanism: the return driving assembly has long service life design of back stop valve and shock-absorbing function, offering easy operation.
回转机构：回转驱动总成具有反转防止阀和减震功能的长寿命设计， 操作更方便。
The KC-135, a cousin of the Boeing 707, entered service in the Eisenhower era and is near the end of its design life.
由波音707改装的KC - 135，是在艾森豪·威尔当政时服役的，(服役时间)已经接近设计寿命。
Just as with design debt's real-life financial analogy, there is an ongoing cost to service design debt, because of the impact on code maintainability.
就像设计债是金融比喻一样，服务设计债的成本由于代码维护性的影响也在不断增加。
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