衰退始于20世纪50年代，当时制造业创造了28%的国民收入（国内生产总值），并且雇佣了三分之一的劳动力。
The decline started in the 1950s, when manufacturing generated a sturdy 28% of the national income, or gross domestic product, and employed one-third of the workforce.
衰退始于20世纪50年代，当时制造业创造了28%的国民收入（国内生产总值），并且雇佣了三分之一的劳动力。
The decline started in the 1950s, when manufacturing generated a sturdy 28% of the national income, or gross domestic product, and employed one-third of the workforce.
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