This crescent-shaped ridge of sand dune in Oman was formed by strong trade winds that form a smooth hill facing the wind (left) and concave slipface on the back.

阿曼一座新月形的沙丘脊由强信风吹成，在迎风的方向（图左侧）形成一面平缓的凸破，在背风面形成凹坡。

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Straddling the ridge of a mountain range shaped like a dragon’s back is, appropriately enough, Dragon’s Back Trail.

横跨山脉的形状像龙的背，真的像一条龙在那里。

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If the tongue naturally maintains a position resting against the ridge or existing denture, then a correctly extended and shaped denture will be easier for that patient to use.

如果舌体自然的保持在一个位置——停靠在牙槽嵴侧面或旧义齿上，那么一个正确伸展和外形的义齿，将更易于此患者去应用。

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