1.I am sure you know how to do it but just a careless mistake.
我相信你知道怎么做，只是一不小心做错了。
2.A careless mistake cost the company thousands of pounds.
一个粗心的错误使公司蒙受数百镑的损失。
3.This is the kind of careless mistake on which her teacher loves to pounce.
她的老师喜欢抓这一类粗枝大叶造成的错误。
4.He made a careless mistake.
他犯了一个粗枝大叶的错误。
5.A careless mistake cost the company millions of pounds.
粗心的错误使公司蒙受数百镑的损失。
6.The professor lambasted me for my careless mistake.
教授严厉批评了我的粗心错误。
7.The boss upbraided Martha with her careless mistake in the report.
老板因玛萨报告中粗心的错误而在批评她。
8.No such careless mistake is allowed once more.
如此粗心的错误绝不允许再次发生。
9.I'm sorry for making such a careless mistake.
我为犯了这样一个粗心的错我向您道歉。
10.I don't know how I made such a careless mistake.
我不知道我怎么会犯这么个愚蠢的错误。