My mom would not allow me to learn swim, so I was always laughed at when the other kids were swimming joyfully in the creeks and I had to take cloths for them., 我的妈妈不允许我学习游泳，因此，当另一个哄骗的时候，我总是被笑正在小溪中欢喜地 ...

The operation of differentiation was first systematized by Newton(1642-1727)and Leibnitz., 微分的计算最早是由牛顿（1642-1727）和莱布尼兹加以系统化的。

" Maybe because in the era of the working class teen, you could get a job at a video store and still afford a car and drive around with your friends and feel free. The sense I had, my friends had, ...