As the world steps up production, "We have to protect the water and air quality.
随着全球粮食产量的提高，“我们必须保护好水和空气质量。
It took a few steps forward, and sniffed the sullen air.
它试着向前迈了几步，嗅了嗅毫无生气的空气。
We are taking steps to prevent stream and air pollution.
我们正采取措施防止河流和空气污染。
The question is what steps we should take to control air pollution.
问题是什么样的措施该采取，以防止大气污染。
Through this project aims to design, control air-conditioning system design, design steps;
目的是通过本工程的设计，掌握空调系统的设计方法，设计步骤；
Through this project aims to design, control air-conditioning system design, design steps;
目的是通过本工程的设计，掌握空调系统的设计方法，设计步骤；
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