The problem is exacerbated by the lack of an adequate replacement for a pair of Earth-observation satellites, the Orbiting Carbon Observatory and Glory, which failed on launch in the past two years.

在过去两年Glory观测卫星失败发射，所以无法提供备用的地球观测卫星，这进一步加重了该问题。

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Allelic exclusion --- In immunogenetics, the observation that only one of the pair of parental alleles for each H chain and L chain of an immunoglobulin molecule is expressed within a single cell.

等位基因排斥：免疫球蛋白的杂合子只表达一对等位基因中的一个的现象。

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The utility model discloses a pair of warm infusion gloves. Each warm infusion glove comprises a fingerless glove. A transparent observation window is formed on the hand back side of the glove.

本实用新型公开了一种输液保暖手套，包括无指手套，其中，手套的手背面设有一透明可视窗口。

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The indoor portion of the observation deck includes a pair of over-size, concave mirrors that produce fun-house reflections of visitors.

BBC: Orbiting views of Olympic London

The pair will soon begin an intense observation campaign that will pin down the variation in height across the globe to an accuracy of better than two metres.

BBC: German radar satellites fly tight space waltz