At present paper, we deduced the relative velocity distribution of mixed ideal gas molecule. Then we got the average collide frequency and average freedistance.
本文导出了混合理想气体中分子相对速度的分布，并由此计算了混合理想气体中分子的碰撞频率和平均自由程。
2
But our kids are growing up in an age when long distance is free on their cell phones.
但我们的孩子则生长在打长途免费的年代。
3
Cell phones are a travel necessity nowadays, multitasking as alarm clocks, not to mention free long distance calls.