"We will bid for the 12 projects next week via system, public bidding, the cost competitive pressure is bigger, can you make a concession on those prices?"
Can I say a pressure is bigger? If there is any other mistake in my sentence above, please help correct, thanks in advance.
You need to specify bigger that what? Maybe you want to say the pressure is huge.
I don't fully understand the gist of your statement, but I may change it like this:
"We will bid for the 12 projects next week via system- pubic bidding. The cost competitive pressure is huge, so can you make a concession on those prices?"
Pressure would normally be "higher".
As for other mistakes, there definitely are because it's nonsensical, to a layperson at least. What is "system", what is the relationship of "public bidding" to the clauses before and after it ? I can guess the relationship between the last two clauses, but they seem weirdly juxtaposed to the first part of the sentence; should this maybe be two sentences ? Without knowing what you're trying to say it's hard to make suggestions for improvement.
