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K-平均值算法不能保证得到最佳稳定性。

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根尖周肉芽肿相应患牙探痛明显。

The ______ of the bottle is flat and circular.

Vocabulary words are the building blocks of your language ability, but don't be with just memorizing vocabulary. It's more useful to know how to use 50 words than to memorize 100. (obsess)

黄河流域是中国古代最主要的产粮区。

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