目的：本研究目的是比较南非中学，大学，俱乐部和省级比赛中橄榄球员脑震荡的季度发生率。

Objective: the objective of this study was to compare the seasonal concussion incidence for school, university, club and provincial level Rugby Union players in South Africa.

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通过大量的省级固定样地资料，对林分生长转移概率模型和进界生长模型进行了参数估计，并对模型进行了比较和修正。

With the data of permanent sample plots, the parameters of transition probability and ingrowth models were estimated, and some models were compared and partly modified.

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或许我的情况在这里比较特殊，本科毕业之后由于个人兴趣爱好的原因我考取了历史学的硕士，在读硕士期间我也是不断的学习进取，在省级刊物上发表了两篇论文。

Perhaps my situation on this place is pretty unlikely, after graduation because of personal interests I am gone to the Heilongjiang University graduate college major in history.

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