self-ˈact·ing 形 不变的
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The railway used three types of power - locomotives, stationary steam engines and self-acting inclines.
en.wikipedia.org He created and patented an invention he called a self-acting bar excavator to be used by ships in crossing bars of sand and clay.
en.wikipedia.org Spiral groove bearings are self-acting because their own rotation builds up the pressure needed to separate the bearing surfaces.
en.wikipedia.org The preparation was done on the second floor and the self-acting mules with 400 spindles were arranged transversely on the floors above on the upper floor.
en.wikipedia.org Many rare items from the period in musical history preceding the gramophone could be seen and heard including self-acting pianos, pianolas and even pneumatic orchestrelle organs.
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