The most extensive search effort in history involved 150planes and dozens of ships , but it didn't find any sign of the missing aircraft at all.
这次有史以来最广泛的搜索努力动用了150架飞机和几十只船，可是却没有发现任何失踪飞机的痕迹。
But investigators have yet to confirm the pings came from the missing aircraft.
但是调查员还在确认这些信号是否来自失联航班。
But China later said it could not confirm the objects belonged to the missing aircraft.
但中国随后表示没法确定该物体是否属于该失联航班。
But China later said it could not confirm the objects belonged to the missing aircraft.
但中国随后表示没法确定该物体是否属于该失联航班。
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