pen
单词辨析：
普通用词，指圈养鸟兽的器物，通常用铁丝或铁条制成。
a bird/squirrel cage
鸟笼/松鼠笼
The tiger paced the floor of his cage restlessly.
老虎烦躁地在兽笼里走来走去。
尤指动物园的大型鸟舍或鸟类饲养场。
There we saw many different kinds of birds in the aviary.
在那里，我们看到大鸟笼里有很多不同种类的鸟。
指关养家禽、兔子等小型动物的笼子或栏舍，尤指鸡笼。
a coop for keeping poultry
饲养家禽的笼子
Who is the man standing near the chicken coop?
站在鸡笼边上的那个人是谁？
指收留走失的狗或猫的地方，在此处这些动物由专人看管，直到其主人前来认领为止。
There's a dog pound on the corner.
拐角处有个走失宠物狗待领所。
相关例句：
A pen is an instrument used in writing with ink.
钢笔是使用墨水的书写工具。
She penned a short memo to his private secretary.
她给他的私人秘书写了一份简短的备忘录。
This lousy pen really drives me mad!
这支破笔真气人！
He gave me a book, a pen and some money besides.
他给了我一本书，一支钢笔，此外还给了我一些钱。
Oh, dear! My pen is missing.
哎哟，我的笔不见了！
He brought out a notebook and pen from his pocket.
他从口袋里掏出笔记本和钢笔。