The side rails should be held by two hands when climbing a fixed ladder.
爬固定梯子时，要双手握住两边的扶手。
Fixed: quick ladder is no longer blocking the construction of objects behind it.
固定：快速梯子不再阻挡它背后的物体的建设。
This paper deals with photo-orientation behavior of a novel photo-alignment film based on the ladder-like polysiloxane containing side-on fixed combined photosensitive groups.
我们制备了一种以梯形聚倍半硅氧烷为基材的新型液晶光致定向膜。
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