Dholakia's study found that 22% of respondents allowed their Groupon coupons to expire without being used, though he warns that vendors' data was somewhat spotty on that metric.
Dholakia的研究发现，有22%的被调查对象并没有使用Groupon优惠券，而是让它们过期作废，然而他提醒人们在这项指标上业主提供的数据有点水份。
Worldwide, data centers left a massive carbon footprint in 2009: 121 billion metric tons, according to a Rice University study, or about 1.6 percent of worldwide carbon emissions.
根据RiceUniversity 的研究报告，全世界的数据中心在 2009 年产生了巨大的碳足迹：12.1 亿吨，这大约占全世界碳排放总量的 1.6%。
First, the way combined with method and experiment were used to study the metric pump.
首先，采用理论与实验相结合的方法对计量泵进行了进一步的研究。
This lays a practical operational foundation for the study of metric universalities and global regularities in arbitrary multimodal maps.
这使得对任意多峰映射的度量普适性和整体规则性的研究有了可操作的现实基础。
In this paper, we study the sensitivity and the topological property of periodic points for topologically transitive semi-flows on a metric space.
本文对度量空间上拓扑传递的连续半流，研究了其敏感依赖性及周期点集的拓扑性质。
In this paper, we study the invariant measures of a continuous map and a continuous semi-flow on a compact metric space.
本文研究了紧致度量空间上连续自映射及连续半流的不变测度。
In this paper, we study the invariant measures of a continuous map and a continuous semi-flow on a compact metric space.
本文研究了紧致度量空间上连续自映射及连续半流的不变测度。
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