在济阳坳陷中，三维地震提供探井井位的有效年限大致在5年左右。
In Jiyang depression, the locations of exploration well given by3D seismic allow useful-life possible about 5years.
在小麦、玉米一年两熟制农田上，进行耕法定位及配合试验，试验表明，耙茬少耕的有效年限为1 ~ 2年。
Tillage location test and its cooperative test in the wheat-maize double cropping field showed that the best time limit for applying disc plough was one or two years.
有些产品过了有效使用年限后是可以回收再利用的。
Some products can be recycled at the end of their useful life.
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