what is the other way to say "A rare barrier" in the english

what is the other way to say "A rare barrier" in the english please tell me ,thank you
冰冰病兵 1年前 已收到1个回答 举报

韩振远 幼苗

共回答了15个问题采纳率:93.3% 举报

a unforeseeable nobstacle

1年前

6
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