The cloud (such as water cloud), which is formed by the inert substance suspending in the air, can prevent or suppress flame and shock wave's propagation.

惰性物质悬浮于空气中形成的云雾(例如水雾)能阻挡或抑制火焰和激波传播。

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If so, then the properties of the waves suggest that the ratio of oxygen to hydrogen in the water cloud where the waves propagated is 10 times as high as in the sun.

若果真如此，则这些波动的性质暗示了传递波动的液态云的氧氢比例，为太阳中的10倍。

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A cloud is a condensation of water vapour in the atmosphere.

云是由大气中的水蒸气凝结成的。

《新英汉大辞典》

Along the bank, a breeze sweeps pink sand into the water, a cloud of fairy dust twinkling in a beam of sun.

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One major unsettled issue in climate science indeed is what this sensitivity is, and several threads of information, including the surface temperature history, and water vapor and cloud data argue Lindzen may be correct.

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As a parcel of dry air rises, it has to rise farther before it saturates with enough water to form the cloud base.

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