The heat period appears at regular intervals.
其发情期有一定的间隔时间。
Ground water heat pump; Energy-efficiency; Cost-effective; Payback period.
地下水源热泵；节能性；经济性；回收期。
Brisbane has previously suffered a period of extreme heat over a Christmas holiday period.
布里斯班以前在一个圣诞节期间遭受过一阵极热。
Brisbane has previously suffered a period of extreme heat over a Christmas holiday period.
布里斯班以前在一个圣诞节期间遭受过一阵极热。
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