1 quick and dirty
= Done or constructed in a hasty, approximate, temporarily adequate manner, but not exact, fully formed, or reliable for a long period of time
I can do a quick-and-dirty market analysis in time for the meeting tomorrow.
2 drop a line = Correspond, write a short letter or note.
I hope you'll drop me a line soon.
3 in other words =
In other words, the bourgeoisie (资产阶级) are a product of the French Revolution.
