Based on reports of Tuesday's plane crash, it's not clear what caused the Germanwings aircraft to go down.
2
德国之翼航空公司的悲剧远未落幕，各方确定事故原因或许仍需相当长的时间。
The Germanwings tragedy is still unfolding, and it's possible that a considerable amount of time may pass before investigators can determine the probable cause of the crash.
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