“下斜”怎么读？

这山坡度缓缓下斜迄平原.The hill descends by a gradual slope to the plain.在转弯的时候, 我们看见路陡然下斜.On turning the corner, we saw that the road descended steeply.山路下斜通向湖边.The mountain path descends to the lake....

“下斜”的英语可以翻译为：declivity ...