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1.The room was too cold, so I turned up the thermostat to a background temperature.
房间太冷了，所以我把恒温器调到了背景温度。
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2. The scientist found that the background temperature of the ocean had increased by 1 degree Celsius in the last century.
科学家发现过去一个世纪海洋的背景温度增加了1摄氏度。
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3. The researchers believe that the background temperature of the planet is slowly increasing due to human activities.
研究人员认为由于人类活动，地球的背景温度正在缓慢上升。