到后来我的手疼极了,几乎在桨柄上合拢不来.Finally my hands were so sore I could hardly close them over the oars.桨的另一种演变途径是增长桨柄而成为梢.Another development of oars into sweeps was due to lengthening the oar handle....
这点碳酸氢钠量即可防止缺钾和骨质脱钙.This modest amount of sodium bicarbonate prevents the potassium depletion and demineralization of bone.目的应用脱钙冻干异体骨 ( DFDBA ) 修复骨缺损,解决种植区的骨量不足问题.Objective To repair bone defect with demineralized freeze...