Even though referential integrity and check constraints are very helpful during the ETL process to help detect data problems, implementing them on final data warehouse tables is not efficient.

在ETL过程中，即时参照完整性和检查约束极其有助于检测数据问题，在最终的数据仓库表中实现它们也不会高效。

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Children should be encouraged to live with or near their old parents, which is very helpful for them to know their parents, conditions and attend their daily life.

应该鼓励孩子生活或接近他们的父母，是他们知道他们的父母很有帮助，并参加他们的日常生活条件。

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The foreign teachers are funny and very helpful. And they also love to study Chinese. I think the culture of China is strange for them.

这些外教老师非常风趣和友好，他们很乐意学习中文，我想中国的文化对他们来说应该是很新奇的。

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