永久性标志 meaning in English
permanent marker
Examples
- To put up permanent marks for under - water cables after their completion and notify related departments in writing of the positions of the under - water cables
（四）水底电缆敷设后，应设立永久性标志，并将水底电缆所在位置书面通知有关部门。 - Bleach ball valves must be permanently marked externally with : the word bleach ; two opposing directional arrows , one inscribed with flow and the other with vent ; and nsf ( symbol of the national sanitation foundation international , indicating approval for use with potable water )
漂白剂球阀必须在外部永久性标志：漂白剂；两个反向箭头，一个标志流向，另一个标志排出孔；以及nsf (美国全国卫生设备基金会国际的标记，表示已认证可用于饮用水) 。