“他们的水泥质量差，但价格便宜，”他解释到。

“Their quality is bad, but the price is good,” he explained.

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古罗马人已经发现火山灰制作的水泥质量更好。

The ancient Romans discovered that volcanic ash made better cement.

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因此，如何保障水泥质量就具有特别重要的意义。

Therefore, how to guarantee the quality of the cement has special meanings.

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