形容词
中文翻译：Unknown
同义词：
['steady', 'permanent', 'unchanging']
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.
河流平稳地流过山谷。
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3.The weather remains unchanged for the next few days.
接下来的几天天气保持不变。