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岩芯也记载了这一事件的年代，表明在当时湖面下降了33英尺。
2.
Additional prospective customers are companies with operational environments requiring sealed mobile devices ( ip54 - rated ) capable of withstanding multiple 4 - foot drops to concrete 其它潜在客户包括工作环境中要求使用能够承受多次从4英尺高跌落至水泥地面的密封移动设备（符合ip54标准）的企业。
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