在低温条件下，水分子会开始聚集并形成微小的冰晶核心。
At low temperatures, water molecules begin to ___nucleate and form tiny ice crystal centers.
大多数动植物细胞都是有细胞核的。
Most plant and animal cells are ___nucleated.
这座小镇围绕着中央广场逐渐发展起来。
The small town ___nucleated around the central square over time.
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