unbroachable造句

• It was certainly unusual because of the rarity of ideas of people exporing environments so extreme as to be normally considered unbroachable, even by sci-fi writers.
• The movie leaves us with the feeling that there are grounds for optimism, but the book is less sanguine about their prospects : " Now here we were in six feet of space-- shoulder to shoulder, in fact-- but the matter of our differences was unbroachable ."