to be reduced to nine-tenths
...crease by ten per cent; to re-duce by ten per cent; to reduce to nine-tenths; to be reduced to nine-tenths 下降百分之十(或十分之一) to decrease by one-fifth; to reduce by one-fifth; to reduce to four-fifths; to be reduced to four-fifths 下降...
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to be reduced to nine-tenths
降为十分之九
以上为机器翻译结果，长、整句建议使用 人工翻译 。