越靠近自由表面，底部射流横向发展越窄，而向上的压力梯度，气泡上升速度，底部射流上升高度越大，反之则反；
The more the bubble close to the free surface, the narrower the bottom jet develops crosswise, and the larger the pressure gradient, the rising velocity and the height of the bottom jet is upwards.
着重对梯度功能材料的研究现状和发展前景作了比较全面的综述。
Attention is focused on the current research situation and the latest development in FGM field.
本文综述了梯度功能材料的设计、制备及性能评价方法，介绍了其应用及发展前景。
The design, preparation and properties evaluation methods of FGM were reviewed. Application and prospect of FGM were described.
本文综述了梯度功能材料的设计、制备及性能评价方法，介绍了其应用及发展前景。
The design, preparation and properties evaluation methods of FGM were reviewed. Application and prospect of FGM were described.
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