一定要有足够的4卷纸的空间以便设备能够自动交替转换，由需要要包装的床垫的尺寸而定。
It must have room for 4 paper widths between which the machine can alternate automatically, depending on the size of the mattresses to be packed.
因为这样的系统不消耗燃料，他们可以有效地使用热量消耗能量而转换耗热量交替模式。
As such systems do not burn fuel, they make possible to effectively use heat consumption energy while switching heat consumption alternating modes.
上下楼之间处于空间的转换和状态的交替，而内街和平台的场所又提示着“串门”和“聚会”。
Upstairs and downstairs imply the transition of spaces and statuses, as well as the plats and inner streets suggest visiting and meeting.
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