The initial investigation included chest X - ray and chest ultrasound.

刚开始的检查包括胸部 X 光及超音波检查.

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In such cases, the authorized officer shall undertake an initial investigation.

在这种情况下, 授权官员应开展初步调查.

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Initial investigation showed that there was a student pilot aboard the plane, police said.

警方表示,初步调查显示,事故飞机上有一名飞行学员.

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