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No, it wouldn't. The matter is it was a sentence from an exercise-book to translate.
I study English and I thank you for help

Thank you. And more: Plains called coastal plains lie on continental borders
or The plains called coastal plains lie on the continental borders

Which is correct: "The envelope of air surrounding the Earth is at least 50 miles thick" or "An envelope of air surrounding the Earth is at least 50 miles thick"?
BTW How to translate Это правильно?...