The reason for constructing the buildings from wood is probably that ideally proportioned straight and slender timber was available in large quantities in Scandinavia's vast pine forests.
用木材建造建筑的原因可能是，比例理想、笔直、纤细的木材在斯堪的纳维亚广阔的松林中大量存在。
2
Have analysed in the role that cuts force, gravity and center very tight force take off, exceed the common workpiece defect in slender axle turning processing produce reason.