Butterfly-fish pluck string-like parasites from it's flanks. 蝴蝶鱼排成一队忙着吃翻车鱼身上的线体寄生虫
Powerful currents sweep up the mountains' flanks transporting nutrients from deep water towards the summits. 带着海底养分的强大的洋流与海底山相接 便顺山而上
Grains, swept up the flanks, are blown off the crests of the ridges 斜坡上吹起的沙粒 在沙丘顶部的边棱处飞扬