Is it really important to learn that word? I never uses it.
It is not important at all. I haven't use it for years (except when you want to talk about the disease :D; sickle-cell disease --> bệnh hồng cầu hình liềm).
Maybe because it is a symbol of communism? Just a thought
Why does Duolingo waste time and memory on these words we'll never use outside of this lesson?
:/ A sickle?! Really? What's next, a corkscrew and a piston valve?
Isn't "use", 'dụng' not 'dùng'?