Driven and supported from above, there is a four-bladed rotating head.

传动的支持部分匀在上部，有四个叶片的旋转头。

youdao

Rotating head range: about 360 degree rotation, upper and lower 180 degree rotation.

灯头旋转范围：左右旋转360度，上下旋转180度。

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Rotary systems work better with higher water pressure, but the rotating head can stick in one place, so periodic checks are required as part of regular maintenance.

旋转系统的工作更好地与较高的水压力，但旋转头能坚持在一个地方，因此，定期检查，作为需要定期保养的一部分。

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The African Union sent Moammar Gadhafi, who currently holds the rotating head of the pan-African body, to mediate the crisis, hoping he could find a solution acceptable to Mauritanian stakeholders and the international community.

VOA: standard.2009.03.12