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 = 换句话说； 就是说 　

　　　　In other words, the bourgeoisie (资产阶级) are a product of the French Revolution.