她头两次的化学作业都没有交，这使她开始这门课时成绩就不合格。
She didn't hand in her first two assignments for chemistry, which started her out in the class with a failing grade.
同时为了不浪费父亲为我交的学费，我一改前非，开始一头扎进浩瀚的建筑知识海洋，并在学习中体会到了无限的乐趣。
I did not want to waste the tuition that my father arranged for me and plunged into the vast sea of architectural knowledge. Involuntarily, I found infinite pleasure.
本组资料共有4类20种异常姿势，以下肢交又、尖足、头不稳定和上肢后伸等最常见。
Among 20 kinds of abnormal postures of 4 types, lower limb across, tip foot, head shaking and upper-limb back stretching were the most common.
建立了考虑刀杆柔性的球头铣刀铣削振动模型，探讨了交变轴向力对刀杆固有频率的影响。
The vibration model of ball end milling process considering the effect of cutter flexibility is presented. The influence of the axial force on the inherence frequency of the cutter is studied.
建立了考虑刀杆柔性的球头铣刀铣削振动模型，探讨了交变轴向力对刀杆固有频率的影响。
The vibration model of ball end milling process considering the effect of cutter flexibility is presented. The influence of the axial force on the inherence frequency of the cutter is studied.
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