a change in quality的用法和樣例：
例句
- Quantitative change is the necessary preparation for qualitative change.
量變是質變的必要準備。 - For one can fairly say that ties between the two sides have undergone a sea change in recent years and Taiwan's economic future is now bound closely to the Mainland.
可以說在過去幾年來，兩岸的關係已經發生了質變，台灣的經濟前途，已經和大陸密切相關。
