Common root
[計] 公根
?? 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;
root
[rut]
n. 根，根源;原因，本質;祖先;[樂]和弦基音;
vt. 使生根;使固定;根源在于;歡呼，喝彩;
vi. 生根;根除;
??? 情景例句
Life has its ups and downs, but it certainly has its rewards.
人生有沉也有浮，但是無論怎樣都確有其價值。
To run for freedom
為求自由而逃跑
Now let's go downstairs and have a cup of tea.'
來，咱們下樓去喝杯茶吧。”