I want to discuss at least my view of its contemporary status after a brief historicalsummary.
在简单的历史回顾以后，我想至少讨论一下我对于生命起源研究的当代进展的看法。
2
The present paper gives a historicalsummary of the mechanical analysis of human head under direct impact in recent years.
本文试图回顾近几十年人头颅受直接撞击作用的力学分析的研究进展情况。
3
In this paper, We have given the historicalsummary of the definition of vector and some application of vector Analyis on the field of vectors in a plane.