It occurs in the communication and conveyance, which is the condition of the variation.

词义的变化是在交际中、在表达中出现的，这是词义变化的条件。

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Geographical variation is one of the most striking features of the condition - it is most common in northern countries such as Canada and Scandinavia and lowest in countries near the equator.

地理差异是该疾病最显著的特点之一，北部国家如加拿大和斯堪的纳维亚发病比较普遍，而靠近赤道的国家最低。

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The influence of milling condition, such as atmosphere and rotation speed of milling on the structure variation has also been investigated.

此外，还考察了球磨条件包括气氛、球磨机转速等对球磨过程中结构变化的影响。

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