Pneumatic drive, linear feed. Adjustable head can be pulled to set positions by drive motor.

采用气压传动，水平直线式工进方式，运动机头由电机拖动行走定位。

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According to adjustable head fall mixer, the effect of mixer parameters on head loss was studied in the model experiment.

通过模型试验，研究可调式跌水网格混合器主要设计参数对水头损失的影响。

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Note particularly the side view, and the remarkable details, including the adjustable head rest, and the compartments for ashtray and integral pipe rack.

特别地注意坐着时的视野，和一些细节，增加了烟灰缸搁置位和可调整的头枕，以及烟斗架。

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It comes in two parts: there's an adjustable cradle that fixes the device to your head, and the computer itself is in a metal bar that curls around the side of your head.

BBC: Motorola unveils a computer that straps onto your head