本文的研究结果说明，对棉铃虫中长期发生态势的预测，存在一定程度的不确定性。
The simulated results suggest that uncertainty exists in some extent to make long term forecast of the bollworm dynamics.
食物链等级体系中的高等级物种平均捕获率(而捕获正在并将持续进行)处于持续上升态势之中——按照所谓食物链等级理论，这应当意味着海洋生态系统的健康平衡发生了变化。
The average trophic level of what is being caught is rising — and this in principle should indicate improving ecosystem health.
综合分析评价了长江流域城市的生态环境态势与问题。
The paper synthetically analyzes and evaluates the urban ecology environment situation and issues in Yangtze River Basin.
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