set off set up step up step in的区别?set off set up step up step 言简意赅!

set off set up step up step in的区别?set off set up step up step 言简意赅!
set off set up step up step in的区别?
set off set up step up step 言简意赅!

set off set up step up step in的区别?set off set up step up step 言简意赅!
step up to a challenge
step in to a situation
set up a shop
set off a bomb
Check the following website
http://www.thefreedictionary.com

抵销 设立 加紧 步骤