在18年的研究基础上，史密斯和他的论文合作者揭示出，海底生态系统的变化可以是几星期到几个月以内的短期变化，同时也可以是长达几年甚至几十年的长期变化。
Based on 18 years of studies, Smith and his coauthors show that such ecosystem changes occur over short time scales of weeks to months, as well as over longer periods of years to decades.
通过个案研究，发现铜鼓在当地之所以能够长期使用，与当地独特的生态环境和文化因素有着紧密的联系。
Through case study, find the bronze drum can use in the locality for a long time, there is connection that can't be isolated with the local unique ecological environment and culture factor.
就不同程度的森林砍伐对其中的土壤动物群落产生的影响进行长期跟踪调查研究具有重要的生态学意义。
It is significantly to study the influence of different slash in evergreen broad-leaved forest on soil animal community.
千年生态系统评估是一项针对长期生态系统变化并预测其未来改变的研究项目。
The Millennium Ecosystem Assessment (MA) is a research program that focuses on ecosystem changes over the course of decades, and projecting those changes into the future.
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.
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.
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