1·Since I exposed myself to the research in materials, I have been aspiring to become a scientist, and God has blessed me with a diametrical life without any waste of time or life.
从我进入材料的领域到今日树立起做一名数学家的理想，上帝让我幸运的获得了走这条直径的机会，没有浪费时间和生命。
2·The length is longer, the influence of diametrical error is more, moreover the semi-finished products 'section exist different shape errors.
长度越长，直径误差的影响越大，而且坯料的截面存在着不同的形状误差。