An expansion wave in accelerating flow broadens.

膨胀波在加速流中变宽。

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NPLS images at high spatiotemporal resolution reveal shockwave, expansion wave, boundary layer and wake in the flow.

高时空分辨率的NPLS图像再现了激波、膨胀波、边界层及尾迹等流场结构。

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A mechanical model of choking flow in the expansion valve was presented, which is based on the expansion wave and gas dynamics discontinuities theories.

通过亚稳态液体闪蒸形成的蒸发波以及气体动力学非连续理论，建立了电子膨胀阀壅塞机理模型。

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Mr Blair hopes agreement will be reached on Russian involvement in decision-making by the planned Prague summit next autumn, when Nato will announce the size of its next wave of expansion.

BBC: Analysis: Nato and Russia draw closer

But the news further depressed the company's share price, which has fallen sharply in the last year, as analysts worried that the company would lose out on the next wave of mobile phone expansion in Europe.

BBC: BT loses in Italian mobile auction