形容词
中文翻译：恒定的
同义词：
['unchanging', 'permanent', 'stable']
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 flowsthrough a constant landscape.
河流穿过一片不变的风景。
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3. The constant rain made it difficult towork outside.
持续的雨使得在外面工作变得困难。