obstacle to的用法和樣例：
例句
- Not be able to pass his mathematics exam proved an obstacle to his career.
他數學考試不及格是他前途上的一大障礙。 - She has the determination to overcome all the obstacle to success.
她有決心克服通往成功路上的一切障礙。 - Verification (eg Checking that weapons have been removed) could be an obstacle to an arms agreement.
裁減軍備協議難以達成，癥結在於如何證實(如檢查武器確已銷毀). - An obstacle to or a censoring of free speech.
言論限制對言論自由的審查或言論自由的障礙
