住宅的大门外有一根竖杆，上面安装着风向标。

Erected outside the front door of this house was a pole equipped with a wind vane on top.

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对带有预定时标齿轮四杆刚体导引机构生成进行了数学描述。

Mathematic description of generation of rigid body geared four bar guidance linkage with prescribed timing is given.

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仪表件、螺栓、螺帽、锻造轴、调节杆、非标、美标、英标等。

Instrumentation parts, bolts, nuts, forging shaft, regulation pole, non-standard, American standard, British standard, etc.

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