By analyzing the relations of two? Echelon inventory level and customer random demand at stores this paper gets optimum order policies.

通过对两级库存水平之间及它们与客户随机需求变量之间的关系分析，我们得到了最优的订货策略和最优的运输频率。

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The big appetite for risk that existed in the upper echelon just two years ago is fading, the survey found, with around 44% of the country's wealthiest looking to spread their risk.

这次调查发现，这些上流人士仅两年前还存在的巨大风险偏好已经在减弱，约44%的富人都在想方设法地分散风险。

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Zhai Zhigang appeared in the "Shenzhou", "Shenzhou VI" flight echelon, with the two "Flying" missed.

翟志刚曾入选“神五”、“神六”飞行梯队，两次与“飞天”失之交臂。

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But this one is mostly about the Indians, who return Monday after going 3-3 against Toronto and Tampa Bay, two teams expected to be in the AL's upper echelon.

WSJ: Cleveland abuzz for Indians, Yankees opener