对于埋地管道，大修时如何保证安全开挖是非常重要的。

It is important to dig buried pipeline safely when rehabilitation is applied.

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如何在运动时保证儿童的安全？

How to ensure the safety of the children when they do exercise?

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如此这般，汽车性能如何保证？汽车安全如何保障？

So and so, how can automobile performance be ensured?

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如此这般，汽车性能如何保证？汽车安全如何保障？

So and so, how can automobile performance be ensured?

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