材料中的杂质影响疲劳寿命。

Impurities in its material affect the fatigue life.

youdao

多年来，波音公司可能已经积累了比任何其他飞机制造商更多的有关飞机机体疲劳寿命的数据。

Over the years, Boeing has probably accumulated more data on the fatigue life of airframes than any other plane-maker.

youdao

一个如图83所示的平均应变或预应变，在某种情况下，能够缩短以后的疲劳寿命。

A mean strain or prestrain, as in FIG. 83, can under certain conditions reduce the subsequent fatigue life.

youdao