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.
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