然后我速度的返回寝室，拿好钥匙，包，关上寝室门，然后随着人群下楼。
Then I speed the return of dormitory, Nahao keys, bag, close the bedroom door, and then with the crowd Xialou.
所有的应用程序，特别是很多web应用程序都需要优化它们访问客户机和将信息返回至客户机的速度。
All applications, especially many web applications, need to optimize the speed that they access and return information to the client.
在碰撞后，假设m2以u2返回，假如m1的速度为u1。
After the collision let's say m2 goes back with velocity u2 prime, and let's say m1 has a velocity u1 prime.
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