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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An ecosystem behaves differently from its individual plant and animal components.

正如一个生态系统的运作也不同于孤零零的一棵植物或者一只动物。

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Thankfully, ext JS includes a powerful class and component ecosystem that makes it easy to extend existing features or build new components entirely.

谢天谢地，Ext JS包含一个功能强大的类和组件生态系统，可以轻松地扩展现有特性或者完全构建新组件。

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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