permanent backing
英 [ˈpɜːmənənt ˈbækɪŋ]
美 [ˈpɜːrmənənt ˈbækɪŋ]
网络 保留垫板
双语例句
- And the only choice of the continueable development of the tourism there is to make the advantage of both nalural resources and ecological surroundings permanent backing, as well as to coordinate the exploitation and protection of natural resources.
使自然资源和生态环境优势成为旅游业发展的长久依托，实现资源开发、利用和保护的协调统一，是滇西北旅游业可持续发展的唯一选择。 - Permanent weld backing bars, consumable inserts and nonconsumable insert rings are not permitted without prior written approval from SECCO.
事先没有赛科公司的书面批准，不允许有永久焊接的支撑杆、熔化性嵌条和不可熔嵌环。