没有风，池塘的水面上几乎看不到波纹。
The air was so still that there was hardly a ripple on the pond's surface.
他滑翔下来并不像一般鸟儿那样伸下双足溅落海中，而是蜷起双足紧贴着身体掠过海面,在水面留下长长一道波纹。
His glides ended not with the usual feet-down splash into the sea, but with a long flat wake as he touched the surface with his feet tightly streamlined against his body.
加上丘陵地区起伏的风向，就产生与水面泛起的波纹相同的效应。
Add wind passing over rolling terrain and "you get the same wavy effect as on the surface of water."
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