导入或导出数据不存在简单的方法。

There's no easy way to import or export this data.

youdao

该代码是从MySQL导出的(其他RDBMS请自行调整)，如果不存在表格，该代码将创建一个。

In this code, which was exported from MySQL (make your own adjustments for other RDBMSs), the table is created if it does not already exist.

youdao

通过利用泰勒公式推导出判断三元函数极值存在的充分条件和极值不存在的必要条件。

By using Taylor's formula, the article deduces the sufficient condition of the existent extreme value and the necessary condition of the inexistent extreme value of trinary function.

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