形容词
中文翻译：持续的
同义词：
['steady', 'unchanging例句：1. The temperature is constant throughout the day.（温度在整个一天中保持不变。）']
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 river flows steadily through the valley.
这条河流在山谷中平稳地流淌。
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3.The sun's rays are constant throughout the year.
太阳的光照射全年不变。