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¡¡¡¡12.A migraine typically afflicts one side of the head£¬ lasts for hours or days£¬ and may recur as infrequently as once every other month or often£¬ as daily.
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¡¡¡¡13.Inflation has made many Americans reevaluate their assumptions about the future£» they still expect to live better than their parents have£¬ but not so well as they once thought they could.
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¡¡¡¡14.The guiding principles of the tax plan released by the Treasury Department could have even a greater significance for the economy than the particulars of the plan
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¡¡¡¡15.Once positioned in space£¬ the Hubble Space Telescope will capture light from sources twenty times fainter compared to those that can be detected by ground-based instruments.
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