apples and oranges(99下~week9)

( 1) idiom: apples and oranges (南轅北轍；完全不同，無法比較)(2) meaning:two entities that are not similar(相似)
(3) example:

Talking about her current(目前) book and her previous(先前) bestseller(暢銷書) is like comparing(比較) apples and oranges.