症结, 困难

a difficulty or problem, especially one that is hidden or not immediately obvious

示例:• The only rub is that we don't have enough money.唯一的症结是我们没有足够的钱。• Here's the rub: we need to finish this by tomorrow.症结在于：我们明天之前必须完成这个。同义词:difficultyobstaclehindranceimpedimentsnag