Pests often target specific tree species and, if they become established, they usually remain as permanent components of the ecosystem.
害虫通常以特定的树种为目标，一旦形成，它们通常会成为生态系统的永久组成部分。
Wild animals are essential components of the delicate ecosystem, and the extinction of one species is likely to cause the disappearance of another.
野生动物是脆弱的生态系统中的一个重要组成部分，一种物种的灭绝会带来其它物种的相继灭绝。
Firstly, this thesis introduced the components, structure, characteristics and functions of a river ecosystem.
首先，系统阐述了河流生态系统的组成、结构、特点和功能。
Although aerosol particle is a small quantity of components in atmosphere, it has important impact on environment and human health, climate change, oceanic and terrestrial ecosystem.
虽然气溶胶在大气中的含量很少，但是它对环境和人体健康、气候变化以及海洋和陆地生态系统有重要的影响。
Food chains are the primary components and existing form of ecosystem.
食物链是生态系统的重要组成部分和存在形式。
Understory vegetation is one of the main components of forest ecosystem.
林下植被是森林生态系统的重要组成部分。
Vegetation is one of the most important components of the ecosystem with 70 percent of the land surface coverage.
陆地表面的70%为植被所覆盖，植被是陆地生态系统的基本组成成分。
Wild animals are the important components of the natural ecosystem, theprecious wealth which universe altogether has.
野生动物是自然生态系统的重要组成部分，是全人类共有的宝贵财富。
Wild animals are the important components of the natural ecosystem, theprecious wealth which universe altogether has.
野生动物是自然生态系统的重要组成部分，是全人类共有的宝贵财富。
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