名词
中文翻译：相变
同义词：
['transition', 'phase change', 'transitional state']
例句：
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1. The system undergoes a phase transition at the critical temperature.
系统在临界温度时经历相变。
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2. During the transition period, the economy is expected to experience significant growth.
在转型期，预计经济将经历显著增长。
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3. The researchers found that the material had a unique phase transition behavior.
研究人员发现这种材料具有独特的相变行为。