Each type can be divided into sub-series or son-series with the difference of study level.
每一类型都具有一定的层次，依研究程度的不同可以划分到亚系列和(或)子系列。
The protecting factor of sub-health was the decreasing of study pressure.
亚健康状态的保护因素为学习压力减小。
The study II was divided into two sub-studies.
研究二分为两个子研究。
Along with the changes of the traditional medical model, sub-health study has become hot.
随着传统医学模式的转变，亚健康状态的研究已经成为当今医学的热点。
Conclusion Injury rate is high in adolescents. Study burden and sub-health status may predict injuries.
结论青少年伤害发生率高，学习负担和亚健康状态可较好预测伤害发生。
Study on optical sub-wavelength structure has been a subject of great interest in recent years.
光学亚波长结构研究是受国际重视的研究前沿。
Study on optical sub-wavelength structure has been a subject of great interest in recent years.
光学亚波长结构研究是受国际重视的研究前沿。
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