侧坡 meaning in English

lateral slopes
side slope

I looked up through the smoke of my cigarette and my eye lodged for a moment upon the burning coals , and that old fancy of the crimson flag flapping from the castle tower came into my mind , and i thought of the cavalcade of red knights riding up the side of the black rock
我透过香烟的烟雾望过去，眼光在火红的炭块上停留了一下，过去关于在城堡塔楼上飘扬着一面鲜红的旗帜的幻觉又浮现在我脑际，我想到无数红色骑士潮水般地骑马跃上黑色岩壁的侧坡。