I made them a reasonable offer but they turned it down flat.
我向他们提出一个合理建议，但是他们断然拒绝了。
Use a pan big enough to lay each piece of fish down flat.
要使用足够大的锅，要让每一块鱼肉都可以平放在锅底上。
When he asked us to pay cash, we turned him down flat.
当他要我们付现金时，我们就直截了当地拒绝。
In such circumstances, I just turn the deal down flat.
面对此类情况，我会直接拒绝这笔交易。
In such circumstances, I just turn the deal down flat.
面对此类情况，我会直接拒绝这笔交易。
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