动词短语
中文翻译：保持热量
同义词：
['keep warm', 'maintain warmth']
例句：
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1. The hot air balloon was flyinghigh above the city.
热气球在城市上空高飞。
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2. She wore a heavy coatto keep warm in the cold weather.
她穿着一件厚重的外套，以抵御寒冷的天气。
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3. Duringthe winter, it's important to maintain adequate heatfor the family.
冬天，保持家庭足够的热量很重要。