copy 的用法及固定搭配

copy

1.可以说a letter in three copies（一封一式三份的信），但不可说a book in five thousand copies。

2.下面三句意思相同：

• The book was published at ¥10 a copy. （这本书出版每本10元。）
• The book was published at ¥10 the copy.
• The book was published at ¥10.