★复杂长句多 ■语法分析 符合汉语习惯 以短代长、化难为易 Factories will not buy machines unless they believe that the machine will produce goods that they are able to sell to consumers at a price that will cover all cost.★复杂长句多 ■语法分析 ■符合汉语习惯 ■以短代长、化难为易 Factories will not buy machines unless they believe that the machine will produce goods that they are able to sell to consumers at a price that will cover all cost