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。

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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。

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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。

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The major components to the education ecosystem include availability of affordable educational resources, discovery vehicles (comprehensive and efficient search), curriculum (goal) management, personal learning networks (social), facilitators, assessment, certification, auditing, efficient labor markets, and more.

FORBES: Education Unleashed: Now It's All Up To You