educe sth by xx%.固定搭配.意为sth减少了百分之xx.
reduce by 即为减少了多少的意思.
by不做任何意思,只做句子成分而已.
区别：reduce to即为减少到...的意思.
例如：He reduced the price of all his goods to 20 per cent.
即为他把他所有商品的价格减少到20％.（2折出售）
He reduced the price of all his goods by 20 per cent
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