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- 新兵一经训练就是好样儿的。
The new recruits will be fine once they've been licked into shape.
- 设计问题一经解决，就容易办了。
Once the design problems were solved, it was all/everything was plain sailing.
- 价格一经商定，交易很快就达成了。
Once the price had been agreed, a deal was quickly concluded.
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