to be re-duced to one-half
...duced to three-fourths 下降百分之二十五(或四分之一) to decrease by one -half; to be re-duced to one-half 下降百分之五十(或一半) some,a few, several, a number of more than ten, over a dozen, no more than twenty 几十 ..
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to be re-duced to one-half
减为一半
以上为机器翻译结果，长、整句建议使用 人工翻译 。