Start by looking at the physical environment.

首先考察物理环境。

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But if we save only the physical environment, we will ultimately lose them both.

如果我们仅仅保留了实体环境，那最终会将二者都丧失殆尽。

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However, man's changes to the physical environment have not always had beneficial results.

然而，人类改变自然环境并不总是带来有益的结果。

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There's a group of people in the United States and elsewhere who studied something called the Built Environment- how the environment is built affects how much physical activity we get.

在美国以及其他地区有这样一群人,进行着被称为环境构建的研究,研究环境的构建是怎样影响我们的活动量

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Ecosystem: organization of the biological community and the physical environment in a specific geographical area.

UNESCO: L O S S A R Y

Clearly, the physical environment has changed very substantially, but what about the economic environment?

BBC: News Online

But the trust has also sought to make changes to the physical environment to help dementia patients.

BBC: Getting it right for dementia patients