by depression ....by 两个by怎么处理? 关于高空防坠装置,标红句翻译讨论: Snaphooks must be sized to be compatible with the member to whom they are connected to prevent unintentional disengagement of the snaphook by depression of the snaphook keeper by the connected member, or must be a locking type snaphook designed and used to prevent disengagement of the snaphook by the contact of the snaphook keeper by the connected member. Only locking type snaphooks must be used. [ ]查看更多4个回答 . 1人已关注