固定链子或钳头的所有销子都应当装到位，并穿上安全销或开口销。
All pins used to secure the chain or jaws should be kept in place with safety pins or cotter pins.
大钳销子，尾绳销子和螺栓都必须用适当尺寸的开口销加以固定。
Rig tong pins, shackle pins and bolts must be secured with the proper size of split pins.
固定百叶窗一个有框架的开口处，比如在一堵墙里，门里或窗户里。安装有固定的或活动的水平条板，用来通风、采光、遮雨。
A framed opening, as in a wall, door, or window, fitted with fixed or movable horizontal slats for admitting air and light and shedding rain.
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