对环境问题的关注已经成为一种不可逆转的历史潮流。
The attention to environment issues has become an irreversible historical trend.
第二个原因是先进交流技术和人们对环境问题的关注。
The second reason is that the advancement of communication technology and people's more attentions on the environmental problems.
随着对环境问题的关注，CO2以其优良的热物性，成为制冷剂中具有良好发展前景的天然工质。
With the increasingly great attention to the environment, CO2 has been regarded as a natural medium for refrigeration with its excellent thermal and physical character and good development foreground.
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