Nine minus four is five.; Four from nine is five.; Subtract four from nine and you have five. 九减四得五。
work with ever increasing zeal; 工作热情有增无减
reduce by half; 减半
Jian Xuan 减宣
牛津高阶第八版
美国韦氏词典
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维基百科 (自由的百科全书)