第二大栖息地是摹仿白鲸的自然生活环境而设计的。
The second largest habitat was designed to copy the natural environment of beluga whales.
对个体的研究可以是在自然生活环境中，也可以是在研究实验室的控制条件下进行。
An individual might be studied in its natural habitat or in the controlled conditions of a research laboratory.
简言之，城市生活环境不如自然生活环境有益健康，这恰恰就是为什么研究者们认为自然更好。
In short, urban environments tend to be a lot less restorative than natural ones and this is precisely why researchers think that nature is so beneficial.
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