Pemba Island has a central ridge, cut by several small valleys, and appears hillier than Zanzibar Island, although the highest point on Pemba is only 95m (310ft) above sea-level.
奔巴岛虽然最高海拔只有95米（310英尺），但是它的中部有一明显的边缘地带，是被一些小的峡谷切断，因此比桑给巴尔岛显得多山。
When using knives, should the blade down, the index finger ridge cut by the knife.
在使用刀时，应刀刃向下、食指按在刀脊上切割。
More, the dispersion characteristic is better, the cut-off wavelength is longer when loaded inhomogeneous dielectric in ridge area, etc.
而在脊区填充非均匀介质以后，截止波长更长，频散特性更好等。
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