heating and cooling degree days
4.1 暖房度日与冷房度日（heating and cooling degree days） 4.2 暖房度时与冷房度时（heating & cooling degree hours） 4.4 冷房日射时IHk (insolation hours) ..
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heating and cooling degree days
加热和冷却度天数
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The problem with the natural gas market is that it is highly inelastic and is subject to massive swings in demand with the degree heating and degree cooling days on a region or even continent.
FORBES: We're Headed To $8 Natural Gas