belays

v.把绳索拴在（桩子、岩石等）上；停止；把绳索栓紧

n.栓紧绳索；绳索固定点

I took a climbing class once and learned how to belay and tie knots, but I've never seen anything like this. 我上过一次攀岩课，学会怎么做制绳和绑绳结，但是我没看过像这样的。

The belay consists of anchor, friction, and position. 固定保护绳包括锚点、摩擦力和位置。