Iven is my best friend.

艾文是我最好的朋友。

Iven's birthday is next month.

艾文的生日在下个月。

Iven likes to play basketball.

艾文喜欢打篮球。

We often go to the park with Iven.

我们经常和艾文一起去公园。

Yesterday, Iven helped me with my homework.

昨天，艾文帮我完成了作业。

By analysis of the whole process of mechanism motion general equation of the dynamics, the change law of the acceleration and impulsive force of the punch pin isg iven out.

通过对机构运动全过程的分析，结合动力学普遍方程，给出了冲头加速度及冲力的变化规律。