我们能源系统的主要组成部分，如燃料生产、提炼、发电和分配，用的是昂贵的、使用寿命较长的装置。

The major components of our energy systems, such as fuel production, refining, electrical generation and distribution, are costly installation that have lengthy life span.

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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。

Pests often target specific tree species and, if they become established, they usually remain as permanent components of the ecosystem.

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可以说，生态系统的特性要比组成生态系统的单个生物体性质更加稳定。

We can say that the properties of an ecosystem are more stable than the individual organisms that compose the ecosystem.

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This is a picture that I showed you before, but basically tells you something that you already know, that humans are made up of organ systems, organs and organ systems, those organs are composed of tissues.

这张图我给你们看过,简单的说明了一些常识,即人体由器官系统构成,器官和器官系统,其中器官由组织组成

耶鲁公开课 - 生物医学工程探索课程节选

Air traffic used to be everything flew to places local to it but now there's a system of hubs, Chicago O'Hare for instance or Newark where planes fly through.

以前的飞机都是飞往它的所属地,但现在的航空运输是一个由交通枢纽组成的系统，例如飞机会途经芝加哥O'Hare机场或Newark机场。

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