虽然房市危机，能源价格剧烈动荡，失业率上升，但美国经济仍在扩张，尽管速度缓慢。

Despite a housing crisis, wild fluctuations in energy prices, and a jump in unemployment, the U.S. economy has continued to expand, albeit at a slow pace.

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虽然许多国家今年的增长速度应该快些，但是某些国家特别是石油出口国的增长将非常缓慢。

While many economies should grow more rapidly this year, some-oil exporters in particular-will experience very low growth.

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虽然这个研究成果在照明和显示上有巨大影响，但LED开关时的速度缓慢限制了其在以光源为基础的通信上的应用。

While the discovery has had an enormousimpact on lighting and displays, the slow speed with which LEDs can be turnedon and off has limited their use as a light source in light-basedtelecommunications.

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