Requires separate propeller (or cups) and wind vane detectors.

需要单独的螺旋桨（或风杯）检测器；

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

住宅的大门外有一根竖杆，上面安装着风向标。

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The wind vane shall be set at distinct positions in the plant area so as to facilitate safe evacuation of the personnel in case of any leakage of toxic gas es.

在厂区显著位置设置风向标，万一发生有毒气体泄漏时，便于人员安全撤离。

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The wind vane shall be set at distinct positions in the plant area so as to facilitate safe evacuation of the personnel in case of any leakage of toxic gas es.

在厂区显著位置设置风向标，万一发生有毒气体泄漏时，便于人员安全撤离。

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