书籍 Solutions - 基础 - 单元 8 - 8C

the time when the sun goes down, it gets dark outside, and we sleep

to go up mountains, cliffs, or high natural places as a sport

having very little or no light

having a relatively great vertical extent

the vertical surface of a rock or cliff that is exposed and visible, often used in climbing

a long, flexible cord made by twisting together strands of fibers, wire, or other material, used for tying, pulling, or supporting things

to rest our mind and body, with our eyes closed

(of a surface) having a sharp slope or angle, making it difficult to climb or walk up

a shelter that usually consists of a long sheet of cloth, nylon, etc. supported by poles and ropes fixed to the ground, that we especially use for camping