如果水气含量较少，便形成云。

If the moisture content are few, then forms the cloud.

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空气在气压及水气含量不变的条件下，受冷至相对于水饱和时的温度。

Temperature to which air must be cooled at constant pressure and water vapor content in order that it shall be saturated with respect to water.

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当然，次要原因的根源还在于钢水气体含量高导致铸坯存在皮下气泡。

Of course, more gas content in molten steel causes that steel billets come into being the subcutaneous bubble is also important reason.

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