Undergrounder
n. 在地面下工作的人, 秘密組織成員, 地下鐵道乘客
??? 情景例句
A credit card is very useful when you go traveling.
當然旅游的時候，信用卡很有用。
I know he will understand your letter.
我知道他會明白我的信。
The only regular visitors to the monastery in winter are parties of skiers who go there at Christmas and Easter.
冬天常來修道院參觀的只有一批批滑雪者。他們在圣誕節或復活節到那兒去。