2012.08.22

drill sergeant
教练军士

come by (somewhere)
=>to visit a place for a short time, often when you are going somewhere else
I'll come by (the office/your house) one day this week and we can have a chat.

come by sth
=>to get something, using effort, by chance or in a way that has not been explained
Cheap organic food is still difficult to come by.
I'd like to know how she came by that black eye.