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The hydrant or valve pit needs to be opened and checked that it's clear rather than filled with any Grime or leaking drinking water. In case the pit is stuffed with water, it ought to be emptied and cleaned.請注意:務必確保已選取的區域來自正確的螢幕截圖(螢幕內),否則裝置將永遠顯示黑色。若您從外接螢