?? 詞語組成解析
common
['kɑm?n]
adj. 普通的;通俗的;[數學]公共的;共有的;
n. [法律]（對土地、水域的）共有權;公共用地;普通;平民;
??? 情景例句
I think aerobics is easy.
我覺得有氧運動很容易。
That isn't the way the event happened.
這不是事情的真相！
Mary is still writing letters. She's been writing letters all day.
馬力還在寫信，她寫了一整天的信。