btw is the abbreviation of by the way, which means: by the way; ps is the abbreviation of postscript, which means: make a note, say something extra.
1. Usage of by the way
1) Definition
By the way, by the way; on the way
2) Examples
By?the?way,?have you?done?anything?behind?my?back?
By the way, are you doing anything behind my back?
2. Usage of postscript
1) Definition
n. Postscript; and
2) Examples
The paper?explores?on?how to?make?teaching?postscript.?
This paper also makes some explorations on how to write teaching postscripts.
Extended information
By the way, other explanations to add
1. add
1) Definition
< p>vi. Add; increase; add up; do additionvt. Increase, add; add; calculate the sum of...
n. Addition, addition operation
< p>2) ExamplesI?should like to?add?that?we?are pleased?with the?test?result.?
I would also like to add that we are The test results are very satisfactory.