derease:
使大小`数量等减少，减小，降低
EG:the number of new students decreased from 210 to 160 this year.
reduce:
1.减小,缩小尺寸,数量,价格等:Reduce the speed.
2.减轻体重,节食:a readucing plan:节食计划
词组:reduce sb or sth to sth orto doing:使陷入境地,使沦落
其余的详见牛津大字典
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