波俄官员称，飞机在靠近斯摩棱斯克机场时遇到浓雾，撞树后，无人生还。

Polish and Russian officials said no-one survived after the plane apparently hit trees as it approached Smolensk airport in thick fog.

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研究表明，溢流坝反弧段内流动存在着微弱的三维结构，流的三维性主要由侧壁边界层及表面棱形波造成。

This may be caused by the side wall boundary layer and prismatic wave on the surface of the flow.

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方法采用气相色谱-质谱（GC -MS）分析法对藏药波棱瓜子脂肪油成分进行分析。

Methods The GC-MS method was applied for analysis the fatty oils.

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