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by的用作介词的意思wewouldliketoincreasethequantityby500piecesforitem.wecan'tacceptyouofferunlessthepriceisreducedby5%.by用作介词有很多意思,在上面两句中by是什么意思?

题目详情
by的用作介词的意思
we would like to increase the quantity by 500 pieces for item.
we can't accept you offer unless the price is reduced by 5%.
by用作介词有很多意思,在上面两句中by是什么意思?
▼优质解答
答案和解析
1.由
2.以...之差