Engel's law, for example, is not absolute.

以恩格尔定律来讲，这个定律并不是绝对的。

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Maslow need theory, Engel's law, the three-terraces management and the history of study of the business administration are accordant.

马斯洛需要论、恩格尔定律、三阶梯管理、企业管理研究史是一致的。

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Engel's law roots in statistics, and through long-term proof around the world, such a fact itself is just the largest and most extensive research specimens.

恩格尔定律来源于统计学，并且经过了世界各地的长期证明，这一事实本身就具有最大最广泛的研究样本。

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Engel's law, however, does not mean that agriculture will, sooner or later, become a slow-growth sector.

ECONOMIST: Stranded on the farm? | The

According to Engel's law, first formulated by the 19th-century statistician Ernst Engel, the proportion spent on necessities falls as wealth increases, and the share devoted to luxuries rises.

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Engel's frustration is pretty indicative of broader voter fatigue when it comes to debate over the health care law and most things in Congress, said David Bositis, a senior research associate at the Joint Center for Political and Economic Studies, pointing to Congress' abysmal approval rating.

CNN: Voters sick of health care debate