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Lerch fears that a significant, permanent reduction in the numbers of visas for scientists and engineers could cause a long-term downturn in the economy. 勒奇擔(dān)心，明顯且持續(xù)減少發(fā)出簽證給外國科學(xué)家及工程師，將造成美國經(jīng)濟(jì)長期走下坡。