First chapter I embarks the external invasion species outline.
第一章主要从对外来入侵物种的概述出发。
In practical ecosystem, there are diffusions, perturbations in species as well as external influence.
作为生态系统，种群自身和相互间的扩散、扰动以及系统外部的影响不可避免。
Cell cycle progression is regulated by a wide variety of external factors, in which reactive oxygen species (ROS) may play an important role.
细胞周期进程由多种外界因素调控，活性氧可能在细胞周期进程中发挥重要作用。
Contents of various species of soil Cd increased with increasing external Cd concentrations.
在单一镉污染土壤中，土壤中各形态镉含量均随着外源镉浓度的增加而增加。
When the biological filter bed is stably treating with domestic wastewater, shapes of biofilm and distributing characters of microorganism species on the external of medium were studied.
研究了生物渗滤床处理生活污水稳定运行时介质表面的生物膜形态和微生物种群分布特征，分析了生物膜及微生物种群的空间变化规律。
When the biological filter bed is stably treating with domestic wastewater, shapes of biofilm and distributing characters of microorganism species on the external of medium were studied.
研究了生物渗滤床处理生活污水稳定运行时介质表面的生物膜形态和微生物种群分布特征，分析了生物膜及微生物种群的空间变化规律。
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