According to outcrop research, drilling core analysis, and sand distributed system drawing, we analyzed the lower member of Zhiluo Formation, northeastern Ordos basin.

作者通过露头调查、钻孔岩心分析和砂分散体系制图，对鄂尔多斯盆地东北部直罗组下段进行了成因分析。

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The paper USES spool valve system drawing equivalent to cartridge valve system drawing to design a typical hydraulic closed-circuit system consisting of two-way cartridge valve.

本文采用滑阀系统图等效成插装阀系统图的方法，设计出一种由二通插装阀组成的典型闭式系统。

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At the same time the ratio of active workers paying into the system to retirees drawing from the system has reached 1.86 to 1.

FORBES: Old Age Pensions 10 Percent of GDP and Rising

The ratio of workers paying into the system to people drawing benefits, after falling from 16.5 to 1 in 1950 to 3.2 to 1 now, will at last stabilize at about the current level.

CNN: A Debt-Threatened Dream

The system appears to be drawing in large numbers of people who have no firm career goals but failing to help them acquire focus.

NEWYORKER: Live and Learn