We are working together for a common purpose.

　　我們在為一個共同的目標一起工作。

　　Shakespeare's work was popular among the common people in his day.

　　莎士比亞的作品在他那個年代很受平民百姓的歡迎。

　　8 is the lowest common multiple of 8 and 4.

　　8是8和4的最小公倍數(shù)。

　　We have lots of things in common besides music.

　　除了音樂，我們還有很多共通點。

　　It's a common mistake among learners of English.

　　這是學英語的人常犯的錯誤。

　　In most people's eyes she was nothing more than a common criminal.

　　在多數(shù)人的眼里她只不過是個普通的罪犯。