Oh, Pen

I only know that a pen is a writing instrument  tool used to write, but today I know, the pen also found out that it means something use which to a cage or a corale to protect animals, or stop animals to go out.  Is it right? Why one word has more than one different meaning? it This is diffcult for me.

Same thing in Chinese.  In your simplified forms, you have 松 to mean a tree and to mean loosen up (鬆).  How about 干?  It has even more meanings under this system.

Oh, Pen

I only know that pen is a tool used to write, but today I know, the pen also means something which is used to protect animals.

or stop animals to go out.is it right?

why one word has different meaning?

some word have shades of meaning that make them more appropriate for some situations.

example: words to describe levels of being angry.

miffed

annoyed

agitated

angry

furious

enraged

livid

apoplectic

it is diffcult for me.  

I'm just glad I dont have to learn chinese ... I think it's harder than english.

:(