名词
中文翻译：常数
同义词：
['permanent', 'stable', 'fixed']
例句：
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1.The constant temperature is a crucial factor in the growth of plants.
恒定的温度是植物生长的关键因素。
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2. The constant pressure from the sun's rays keeps the earth's surface warm.
太阳光线的持续压力使地球表面保持温暖。
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3. The constant flow of water is essential for life on Earth.
水的持续流动对地球上的生命至关重要。