茎状中柱的髓显得颇强健,像厚角组织.The pith of this stemlike stele appears rather strongly like collenchyma tissue.围绕中柱的是中柱鞘.Surrounding the central cylinder is the pericycle.中柱包括从原形成层衍生而来的全部初生组织,由中柱鞘 、 韧质部和木质部组成.The stele includes all p...
飞机的副翼是用铰链装在机翼上的.The ailerons on an airplane are hinged to the wing.正的副翼偏转角产生绕X轴的负方向力矩.Positive aileron deflection produces an anti - clockwise moment about the X axis.副翼是机翼后缘的可动部分.The ailerons are movable sections along ...