Is this sentence grammatically and lexically correct?
'For me, foreign language is the stem of a teaching and translating career'
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In the midwest of the United States, we might replace "stem" with the word "bedrock" or "foundation." But we might also change the whole thing around a bit and say something like...
I believe that the knowledge of a foreign language is an absolute necessity for a career in language teaching and translation.
However, this changes the entire sentence from a statement to an assertion. Good luck!
The sentence doesn't clearly convey the idea you wish to express. You should define foreign language--speaking or knowing one? Also, "stem" is not what we would use. Foundation has been suggested but I would choose "basis."
"For me, speaking a foreign language is the basis for a teaching and translating career."