Colluvial deposits at the foot of valley slopes usually affect only narrow strips of valleybottom.
河谷坡脚处的崩积体通常只影响到谷底较窄的地带。
2
Domestic mobile telephone is steadily losing ground under offensive of ocean cell phone, exceed the valleybottom falling half to 30% from market share.
国产手机在洋手机凌厉攻势下节节败退，从市场占有率超过半数跌到30%的谷底。
3
The deep troughs on the Three Gorges valleybottom are formed by river downcutting along the structurally zones on the background of regional tectonic uplift.