For decades, water utilities used armies of technicians with listening sticks to check for leaks. The practice involves prodding the ground with a long metal rod, pressing an ear to the earpiece at the top, and waiting for the hiss of a leak from the pipes beneath.
几十年来，水务公司一直派出大批技术人员，拿着听音棒检查漏水点。做法是用一根长金属杆探地，将耳朵贴在顶部的听筒上，等待听到地下管道漏水发出的嘶嘶声。
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