1·Because of drainage, sweep, slight heat expansion, and contraction, etc. there should be some proper interstice among the edges and the ends.
考虑到排水、清扫以及轻微的热膨胀、收缩等原因，塑木型材安装时，边到边、头到头之间必须留有适当的间隙。
2·Because of the interstice between pin and pinhole, the initial geometric displacement is generated, and then the bearing capacity of the structure is reduced.
销孔间隙会使体系产生初始几何位移，并对结构的承载力产生不容忽视的影响。