该方法将原参数非定常欧拉方程组重新组合成以广义黎曼变量表示的欧拉方程组，再用二点二步迎风格式离散求解。

Euler equations of generalized Riemann variable are derived from unsteady primitive variable Euler equations and solved by using two - a point-two-step upwind finite difference method.

youdao

这里要注意一点：如果采用这种方法，就必须修改对原udf的调用，改为执行存储过程并提供一个额外的OUT参数。

A point to note here is that if this approach is followed, the calls to the original UDF will have to be modified so that they now execute the stored procedure, and supply an extra OUT parameter.

youdao

这个扩展 Box 的问题是，只能将内容放到类型参数与原 box 完全相同的 Box 中。

The problem with this extended Box is that we can only put the contents in a Box whose type parameter is exactly the same as the receiving box. So, for example, the code in Listing 3 won't compile

youdao