Sometimes also in saliva, but not to low concentrations can be spread.
唾液中有时也有，但浓度可以低到不能进行传播。
In both cases, high concentrations of the gas are dark, while low concentrations are light.
在两幅图中，气体密度越高的区域颜色也就越深，低密度区则更浅。
The concentrations of total phosphorus was high in winter, low in summer.
全磷含量是冬季最高，夏季最低。
The concentrations of total phosphorus was high in winter, low in summer.
全磷含量是冬季最高，夏季最低。
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