我们已经良好地运用了更多的标准二级数据库、采访、案例和调查问卷方法。

And we have made good use of the more standard secondary database, interview, case, and survey methods.

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证明不存在四个连续的二项系数成算术级数。

Prove that no four consecutive binomial coefficients can be in arithmetic progression.

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类似地，绿色的行是第二级数据项(之下的字段是该级别的属性)。

Similarly, rows in green are second-level items (and the fields under that are attributes at that level).

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