A tiny electromechanical switch under the bottom mirror can also lift it up, adjusting the spacing and preventing it from reflecting any light at all.
底层镜子下的一个微型机电开关也能抬高镜子，从而调节间距并防止镜子反射任何光。
Dot them around the tree from top to bottom, spacing them out evenly.
从树顶到底部围绕树身点缀，保持均匀的间隔。
The axial load and centralizer spacing from the bottom to the top are calculated by using the mechanical analysis method and the well trajectory data.
采用力学分析的方法，结合井眼轨迹数据，由下到上逐跨计算了抽油杆柱的扶正器间距和轴向力。
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