but purify the air and build system

but purify the air and build systems that are energy consumption conscious and responsibly eliminate harmful gases so as not to pollute the air further.”

Results (Chinese) 1:

但净化空气，构建系统，能源消费意识并负责任地消除有害气体，以免造成进一步的空气污染。

Results (Chinese) 2:

但净化空气，建设一个具有能耗意识的系统和负责任地排除有害气体，以免进一步污染空气。“

Results (Chinese) 3:

但是净化空气和建立能源消耗意识和负责任地消除有害气体，不污染空气。”