因为合同中的重大失误，我们损失了一个重要客户。

We lost an important client because of a major ___screw-up in the contract.

汤姆是我们团队里的糊涂蛋，每次都会把事情搞砸。

Tom is the ___screw-up in our team who messes things up every time.

项目延期交付完全是因为团队的一次严重失误。

The delayed delivery was caused by a major ___screw-up in our team.