形容词
中文翻译：持续的
同义词：
['unchanging', 'everlasting']
例句：
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1.The temperature is constant throughout the day.
温度在整个一天中保持不变。
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2. The sun's position is constant, so we can always find it in the same place.
太阳的位置是恒定的，所以我们总能在相同的位置找到它。
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3. The river flows through a constant landscape of forest and meadow.
河流穿过一片始终如一的森林和草地景观。