Stone cage net protective structure is in itself under the action of gravity for the installation.

石笼网防护结构是在其本身重力的作用下进行安装的。

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Automatic water sluice gate is under the waterpower and action of gravity, in the given water height condition; and it start and stop automatically as the flux change.

水力自控闸门是借助水力和重力作用，在一定的水位条件下，随流量的变化，自动启闭的自动化闸门。

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Based on the mechanics of wave, the expression of water wave propagation velocity under the action of gravity is deduced and the effect of surface tension on small wave is analyzed.

本文根据波动理论推导出在重力作用下波的传播速度表达式，分析了微小波动中表面张力的作用。

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"I am conscious of the gravity of my action, " he said, receiving a standing ovation from 8, 000 pilgrims from around the world gathered in the Vatican's main audience hall.

BBC: Pope Benedict holds last public Mass