n. a writing implement with a point from which ink flows
n. an enclosure for confining livestock
n. female swan
n. 钢笔, 笔, 笔调, 笔杆子, 作家, 围栏, 栅栏, 禽畜
vt. 写, 关入栏中, 囚禁
vi. 动笔, 写作
1. I need a pen to write a letter.
我需要一支钢笔来写信。
2. Can you pass me that pen, please?
请把那支笔递给我，好吗？
3. She always carries a pen in her backpack.
她总是在背包里带着一支笔。