saddle region的用法和样例：
例句
- According to the changement of the rubbery region, the diffusion of solvents in the rubbery region will be a free-boundary problem.
由于胶状区域的变化，在胶状区域的溶液扩散将是一个自由边界问题。 - Another linear zone extends in a southwesterly direction from the region of most intense activity into northeastern Arkansas.
另一条线状区域是从最强烈的地震活动区起，向西南延伸到阿肯色州东北部。
