既使我们把一个制动片放进气缸以阻止活塞在某点继续上升，也不能计算功。
Even if we put a catch in the cylinder to stop the piston at some point in its rise, we still can't calculate work.
对某类涂层随涂层硬度增加，刮削功上升并有一阈值，以此值可确定生产中检验硬度范围的上限。
The upper limit of the range of the coating hardness used in the quality control in production can be determined according to the threshold in the specific work hardness curve.
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