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No wonder people are moping in Silicon Valley. But each time the U.S. tech sector falls into a trough, new technologies and companies emerge to lead it forward again. And it could happen sooner than the pessimists fear. The two keys to recovery will be innovation and cost-effectiveness. Alan Greenspan, to name one influential observer, remains optimistic. “By all of the evaluations we can make,” he told the Senate Banking Committee in July, “we are only partway through a technological expansion.”

The main idea of the paragraph

Each time the U.S. tech sector falls into a trough, new technologies and companies emerge to lead it forward again, thanks to innovation and cost-effectiveness. While people are depressed with the economic performance, an economic recovery is there waving to us.

每当美国经济中技术这一块跌入低谷时，总会有新的技术和新公司涌现出来，依靠创新以及降低成本提高效益再度引领它向前；当人们因为经济表现不佳而沮丧时，经济复苏则在不远处向我们招手。

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