n. undulation
砂丘相对平坦或有波状起伏的覆草沙地，通常在海岸边。
Relatively flat or undulating sandy turf-covered ground usually along a seashore.
在分化细胞中，质膜呈波状起伏或形成某些大小不等的质膜内陷。
The undulate plasmalemma or some invaginations of plasmalemma varied in size was observed in the meristematic cells.
发现沿切变线走向有一条中尺度涡管，位于对流层中低层，高度呈波状起伏。
The results showed that there was a mesoscale vortex tube along the mesoscale shear line on the middle low troposphere, and its altitude varied in a wave shape.
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