X permission at the directory?

["Monty Ree" <chulmin2 () hotmail com>]

Hello, all.

I have some questions about permission.

I think that W(write) permission means that I can delete, creation..etc..
So, I think that users who in the test group can write some files in the 
test directory. 
Because, I have write permission.

drwx-w----     root     test     test/

But I can't, with only plus X(execute) permission like below can do that.

drwx-wx---     root     test     test/

What's the meaning of the X(execute) at the directory?
Surely, I know the role at the file.


Thanks in advance.

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