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潜水机器人将用于搜寻马航客机 Teams searching for the missing Malaysia Airlines plane are to deploy a robotic submarine for the first time. 马航失联客机的搜救队将首次使用机器人潜艇进行搜寻。 The Bluefin-21 will search the sea floor for wreckage from flight MH370 Search chief Angus Houston said the Bluefin-21 drone would be sent down as soon as possible to search for wreckage on the sea floor. Teams have been using a towed pinger（声波发射器） locator to listen for signals from the plane's "black box" flight recorders. But no new signals have been heard since 8 April, amid concerns the flight recorders' batteries have expired. Flight MH370 went missing on 8 March with 239 people on board. It was flying from Kuala Lumpur to Beijing when it lost contact with air traffic controllers over the South China Sea. Malaysian officials believe, based on satellite data, that it ended its flight in the southern Indian Ocean, thousands of kilometres off course. 'Manageable search area' An international search has focused on waters west of the Australian city of Perth, with teams racing against time to detect signals before the flight recorder batteries - which last about one month - run out. Air Chief Marshal Houston, who heads the joint agency co-ordinating the search effort, said that given no signals had been detected in six days, it was time to go underwater. | 
