The total time spent on the problem was approximately five days of our time, plus another 10 to 20 days for their developers to code and test the successful new approach.
解决这个问题共花费了我们大约5天时间，再加上他们的开发人员编码和测试成功的新方法又用了10到20天时间。
The total time spent on the problem was approximately five days of our time, plus another 10 to 20 days for their developers to code and test the successful new approach.
解决这个问题共花费了我们大约5天时间，再加上他们的开发人员编码和测试成功的新方法又用了10到20天时间。
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