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to hit the wall ----------受阻（成语）
英文释义
(IDIOM) To encounter the most difficult part of a task; to meet an obstacle that slows progress.
例句
Our ambitious new project went smoothly for the first month, but then we hit the wall and realized that it was going to be much more difficult and expensive than we thought.
我们雄心勃勃的新项目在第一个月时进展顺利，但是后来，我们遇到了阻碍，发现它远比我们估计的更加困难和费钱。
n. 障碍，绊脚石
