At the foot of the slope there are cinder block houses, but as you climb the ridge, concrete gives way to wood and tarpaulin, then cardboard and twigs.
坡脚下有些炉渣砖的房子，越往上到了山脊处，就只有些木材和防水布，或者纸板和树枝搭建的房子。
2
At the foot of the drainage on embankment slope, there must be a drain, the depth and thickness of which must guarantee enough draining section when the surface is frozen.
The foot of continental slope is an important terrain characteristic and is a basic evidence to get the out limit line of the expansion continental shelf right.