形容词
中文翻译：持续的
同义词：
['unchanging', 'unvarying']
例句：
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1. The temperature is constant throughout the day.
温度在整个白天都是恒定的。
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2. The sun's rays are constant throughout the year.
太阳的光线全年都恒定。
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3. The company's policy of constant improvement has beensuccessful.
公司不断改进的政策已经取得了成功。