介绍了大气孔砂轮磨粒的特性，针对胶辊磨砺过程的特殊性，重点分析了磨胶辊时砂轮的选择、修整及使用时解决实际问题的办。

Considering the special requirement of the grinding process of cots, highlight is given to the selection, finishing and application of grinding wheels in practice.

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相反，当大气二氧化碳浓度低时，气孔密度似乎增加了——就像长出更多的嘴来呼吸。

Conversely, when atmospheric carbon dioxide is low, stomatal density tends to increase - it's like getting more mouths to breathe with.

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Dilcher说：“二氧化碳在大气中的含量每增加万分之一就会对植物气孔的数量产生深远的影响，同时还会使气孔的宽度变窄。”

"The increase in carbon dioxide by about 100 parts per million has had a profound effect on the number of stomata and, to a lesser extent, the size of the stomata, " Dilcher said.

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