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foot drop 垂足病。

foot fault

Additional prospective customers are companies with operational environments requiring sealed mobile devices ( ip54 - rated ) capable of withstanding multiple 4 - foot drops to concrete 其它潛在客戶包括工作環境中要求使用能夠承受多次從4英尺高跌落至水泥地面的密封移動設備(符合ip54標準)的企業。

Sediment cores from lake titicaca itself also chronicle the event , showing a 33 - foot drop in the lake level at the time 提提卡卡湖沉淀物的巖芯也記載了這一事件的年代,表明在當時湖面下降了33英尺。