1. What makes them "greenhouse gases"? ������������?
2. This method can be used to improve accuracy and robustness of the greenhouse control system. ���ø÷�����������ҿ���ϵͳ�ľ�ȷ�ԡ���Ӧ�Ժ�³���ԡ�
3. It is the least polluting of the fossil fuels, which means it should be in demand if the world adopts tighter constraints on greenhouse gases. ��Ȼ������Ⱦ���ٵĻ�ʯȼ�ϣ�����ζ�������������������ŷŲ�ȡ�ϸ�����ƣ�Ӧ�û��ж���Ȼ��������
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n.
1. a building with glass walls and roof; for the cultivation and exhibition of plants under controlled
2. of or relating to or caused by the greenhouse effect
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