这是一根长为5米的直线。
孩子和父母之间，是有一要直线连着的，那是一根象征关怀的线。
Between children and their parents, is have a straight line connecting to the root, and that is a symbol of the care line.
直线导轨单元t BR系列一个支撑轨和一根轴的组合。
Linear guide unit SBR Series a support rail and a combination of axes.
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