登山运动员用的套绳器
Jumaring, or climbing fixed lines with mechanical ascenders, is another Big Wall skill you need to master to efficiently aid climb one I was still figuring out.
WSJ: Training for the Big Wall | By Michael J. Ybarra
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。