When we write english,we will use many punctuations,so please supply more comments about them:
The Name,The Pronunciation,When will be used...etc
When I meet some mail adree such as: XX-aa or xx_aa,I will puzzled how to read it.
Anyone would like to supply more explaining?

Replying to [AlexWang]:Dear alex,

your first punctuation is called the dash or hyphen & second one is being pronounced as "underscore"

But you have raised a good point for punctuation which are the genral mistakes in written english.

Quoting from [AlexWang]:


When we write english,we will use many punctuations,so please supply more comments about them:

The Name,The Pronunciation,When will be used...etc

When I meet some mail adree such as: XX-aa or xx_aa,I will puzzled how to read it.

Anyone would like to supply more explaining?

Hi Alex,

the way the - (hyphen) is used in your example, it only makes clear that some kind of extension will follow. For example, you could be living on "Calle de la Rosa # 327-1".

I used a Spanish Address here, because in the US you first write the number of the house, then the name of the street, and last of all the apartment number. In my example, the number 1 after the - indicates the "attachment" to the address, the apartment number.

It is only used to separate the numbers. If you wrote 327 1 instead of 327-1, it could lead to confusions. So it is only used for clarity.

Germex

Alex,
The example you are using is not so much English as "computer".

Until the Internet became big the us of the underscore was almost never... Once the Net hit the - and _ basically are just "spaces" because the internet does not allow the use of a space in an email address or a web address....
The 3 variations are - (hyphen) _ (underscore) and . (period).

Their uses in email addresses and in web addresses are really just to show where words are to be separated.
Example: alexwang@alibaba.net could also be done as alex-wang or alex_wang or alex.wang

That way people know your name better....