200万年前，在树木丛生的谷地和波状丘陵地带的起伏平原之下，是洞穴密布的地下蓄水层。
Two million years ago, a cave-studded aquifer lay beneath an undulating plain of shallow, wooded valleys and rolling hills.
通过肉眼和放大镜下观察，翡翠玉器的抛光表面一般都可见到微波状起伏，即微波纹。
The wavy lines on the polished surface of jadeit jade are visiable to the naked eye or observation under magnification.
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.
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