n.

1. 笔[C]，钢笔
   The contract must be signed with a pen, not a pencil.

   这合同一定要用钢笔而不用铅笔签字。

2. 文笔；笔调；笔法
   He has a lively pen.

   他的文笔生动逼真。

3. 写作
   She makes a living with her pen.

   她以卖文为生。

4. 作家[C]

vt.

1. 写；写作
   I penned a letter to my aunt today.

   今天我写了一封信给姑妈。

n.[C]

1. （关禽，畜的）栏，圈；一栏家畜
   The dog chased the sheep into the pen.

   狗追赶羊入栏。

2. 潜艇修理坞
3. 婴儿围栏
4. （堆积货物等用的）栏栅

vt.

1. 把（家畜）关入围栏；把……关起来
   The convalescent child penned up in the house was yearning to go out and play with his brothers.

   那个关在屋里养病的孩子渴望出去与兄弟一起玩耍。

2. 囚禁

n.

1. 【俚】监狱[C]

n.

1. an instrument for writing or drawing with ink, typically consisting of a metal nib or ball, or a nylon tip, fitted into a metal or plastic holder.
   ▸ (the pen) writing as an occupation.
   ▸an electronic device used in conjunction with a writing surface to enter commands or data into a computer.
2. Zoology  the tapering cartilaginous internal shell of a squid.

v.

n.

1. a small enclosure in which sheep, pigs, or other farm animals are kept.
2. a covered dock for a submarine or other warship.
3. (in the West Indies) a farm or plantation.

v.

1. put or keep in a pen.
2. (pen someone up/in) confine someone in a restricted space.

n.

n.