The purpose of the expansion screw is to fix the light box base and the concrete pier below.
膨胀螺丝用途是将灯箱底座与其下面的水泥方墩固定。
"If you have moved house, you know how much time is wasted constructing the base of the box before you can put anything in it, and it's even worse on a factory assembly line," he says.
“如果你曾经搬过家,你就会知道在装东西之前把盒子撑起来是件多花时间的事情,在工厂的装配线上问题更加严重,”他说。
Many base components are available right out of the box.
很多基本的组件是现成可用的。
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