名词
中文翻译：成核期
同义词：
['nucleation', 'nucleation time', 'nucleation point']
例句：
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1. The growth of a new crystal begins with the nucleation period.
新晶体的生长始于成核期。
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2. During the nucleation period, the material is very fragile and can easily break.
在成核期，材料非常脆弱，容易破裂。
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3. The nucleation period is crucial for the formation of new crystals.
成核期对于新晶体的形成至关重要。