Here is the collection of phrases or vocabularies I have learned.
A back-of-the-envelope calculation is a rough calculation, typically jotted down on any available scrap of paper such as an envelope. It is more than a guess but less than an accurate calculation or mathematical proof. The defining characteristic of back-of-the-envelope calculations is the use of simplified assumptions. A similar phrase in the U.S. is “back of a napkin“, also used in the business world to describe sketching out a quick, rough idea of a business or product. In British English, a similar idiom is “back of a fag packet“.
roll out – 推出(產品, 服務)
since the platform is going to take a while to roll out I want to show some use cases for our compound partnership