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。
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。
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。
It is very helpful to acquire the characteristics of idioms for better understanding and use of them.
把握成语中的古汉语特点对于正确理解和灵活运用成语具有极大的作用。
It is very helpful to acquire the characteristics of idioms for better understanding and use of them.
把握成语中的古汉语特点对于正确理解和灵活运用成语具有极大的作用。
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