It was made of soft lumber, spruce by the look of it.其制作材料是软木，看起来像是云杉。The truck was sent to carry lumber.卡车被派出去运木材.Forested areas have been expanding every year, with the increase in standing timber greater than that of ...
James Gregory gave in in his " Geometriae Pars Universalis " a method of rectifying curves.JamesGregory在他的《几何的通用部分 》 中给出了计算曲线长度的方法.The dangerous type chronic otitis media occurs with pars flaccida and marginal perforatio...