如果子区域尚不存在，创建子区域。

Create subregion if it does not already exist.

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如果子区域不存在，请予以建立。

Create the subregion if it does not already exist.

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本文讨论了太阳活动区和黑子区的无力场的演化。

In this paper the evolution of force-free magnetic field was discussed.

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一般总是更大的一揽子区域计划或政策的一个局部。

It has generally been part of a much larger regional plan or policy package.

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这是一个很明显的例子区别于那些去学校和自学的人。

This is a clear example of the difference of going to school versus self-teaching.

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这是因为在弱光环境中眼睛对不同调子区分能力降低。

The eye has a harder time differentiating two values in lower light.

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可以使用该对话框构建SQLCREATETABLE命令的子区段。

You can use this dialog to build a subsection of the SQL CREATE TABLE command.

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可以使用该对话框构建SQLCREATETABLE命令的子区段。

You can use this dialog to build a subsection of the SQL CREATE TABLE command.

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