然而，钢架的柱子是可以随着摇晃自由上下摆动，有钢管托牢牢固定在基座上。
The frame’s columns however are free to rock up and down within steel shoes secured at the base.
然而，钢架的柱子是可以随着摇晃自由上下摆动，有钢管托牢牢固定在基座上。
The frame's columns, however, are free to rock up and down within steel shoes secured at the base.
它的标准沙发底座是黑色聚丙烯材料，用螺丝固定在钢架上。
Its standard feet are black polypropylene, screwed to the frames.
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