The extraction of soil erosion in complex topographical region is much more difficult than that in flatregion.
相对与地形平坦地区，复杂地形区土壤侵蚀的提取存在较大的难度。
2
The frequency response of the drive-direction oscillator has two resonant peaks and a flatregion between the peaks.
陀螺驱动频率响应曲线有两个谐振尖峰，在两峰值之间存在一个较平坦的区域。
3
In that region small breasts are not the sign of sickness, they are the sign of (a little bit depressing and flat) normality, and it almost cost thousands of ladies the use of their Vespas.