very tough and determined
非常坚强和有决心 (feichang jianqiang he you juexin)
"She’s hard as nails when it comes to achieving her goals."
"她在实现目标时非常坚强和有决心。" (ta zai shixian mubiao shi feichang jianqiang he you juexin)
a constant source of annoyance or trouble
Don’t become discouraged.
to take responsibility for doing something important
something so impressive that others find it hard to match or...
to suddenly realize the solution to a problem
small adjustments to improve something
