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1·Tipping is a kind of comprehensive social phenomenon, which is related to social custom and economic significance.

小费是一种综合性的社会现象，它与社会习俗和经济意义有关。

2·And models to characterize the economic significance.

并对模型的经济意义进行特性。

3·This determines their whole nature and economic significance.

这决定了它们的性质和经济学意义。

4·The solution of such kind of stray current corrosion is of great social and economic significance.

解决这种杂散电流腐蚀的问题有很大的社会意义和经济意义。

5·Doing well in the management of reverse logistics has an important social and economic significance.

做好逆向物流的管理具有重要的社会和经济意义。

6·Poly-N-(vinylbenzyl)ethylenediamine is a functional polymer of scientific and economic significance.

聚N-（乙烯苄基）乙二胺是一种很有用的功能基高聚物。

7·Then, give the economic significance and calculational methods of these four kinds calculational methods.

然后，重点介绍了四种类型的技术进步贡献的经济意义及计算方法。

8·Therefore, the study on rural women human resources in Western China has great social and economic significance.

因此，研究西部农村女性人力资源具有重要的理论意义和现实意义。

9·The economic significance of the move was small, in that almost no investors had to sell Treasuries because of the downgrade.

降级的举措带来的经济意义不大，没有投资者因为信用降级而不得不抛售国库券。

10·It said that the durability of the valve is an important performance indicator valves, and has great economic significance.

它表示阀门的耐用程度，是阀门的重要性能指标，并具有很大的经济意义。