Finally there are mechanical skimmers - ideal for retrieving heavy oils - which use metal tooth discs, grab buckets and drum separators to remove the oil then pump it into a tank.

最后还有从回收重油方法改进而来的机械分离器，采用金属齿轮盘将油捞起，然后采用分离机将油分离出来放到储罐中。

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Zhang Heng was also a mechanical engineer, and made a flying "wooden eagle"and a "mileage-counting drum-cart".

张衡又是一位机械工程师，制造过能飞的“木雕”和能计算里程的“计里鼓车”等。

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The results show that the anode passivation can be decreased through the mechanical force of the drum anode, and the current efficiency can be improved.

结果表明： 转鼓阳极的机械力作用可以缓和阳极钝化，提高硬质合金废料电解的电流效率。

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It functions as a wonderful mix of the mechanical and the organic, as a steady drum machine and languid pedal steel ring out side by side.

NPR: Heartfelt Emotion in an Orchestral Arrangement

De Vaucanson built two astonishing humanoid musicians--one played the flute and the other played pipes and drum--yet the automaton that brought him the most fame was a life-size mechanical duck.

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