to keep from losing forests for trees

what's the meaning?
Jacky, it's not a bad question. "To keep from losing forests for trees" was a bad rendering of the quotation.
Students: Are you brave enough to let our tutors analyse your pronunciation?
thank u,but why is it a bad question?
 BarbaraPA's reply was promoted to an answer.
Students: We have free audio pronunciation exercises.
oh i see,thank u
All questions are good ones Emotion: smile