应力越高，在可以预料的破坏之前循环次数就越少。
The higher the stress the fewer will be the cycles before failure can be expected.
在低循环应力时，真空环境中的疲劳断裂次数可比室温大气环境中的高近4倍。
Under lower cyclic stresses, the fatigue cycles to failure in vacuum is increased approximately 4 times than in air.
在低循环应力时，真空环境中的疲劳断裂次数可比室温大气环境中的多2至3倍。
Under lower cyclic stresses, the fatigue cycles to failure in vacuum is increased 2 or 3 times.
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