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1. He had coarsened his voice to an approximation of Cockney.

他让自己的口音变得粗俗起来，接近伦敦东区的发音。

2. That's just an approximation, you understand.

你知道那仅仅是近似值。

3. This is the nearest approximation of cost that they can give us.

这是他们能够给我们的最接近的费用估价.

4. That is a fair approximation of the way in which the next boss is being chosen.

那和下一任老板的选任方式相当类似。

5. Clearly that's an approximation, but my guess is there'll be a reasonable balance.

很明显那是个粗略的估计，但我猜会有一笔不少的余额。