I hope you won't make a careless mistake again.
我希望你不会在犯这样粗心的错误。
Don't be hasty; it's better to take your time than to make a careless mistake.
不要草率行事；和马虎犯错相比，多花点时间好得多。
Don't make such a careless mistake again.
不要再犯这种粗心的错误了。
How could you make such a careless mistake?
你怎么能犯这么粗心的错误？
We had never expected to make such a careless mistake in the project.
工程中出现这样的纰漏是万万没有想到的。
Don't make such a careless mistake.
不要犯这样粗心的错误。
It's careless of you to make such a mistake.
你犯这样的错误真是粗心。
Although this is originated from Guardian, a big brand in journalism, simple mistake can still slip in from careless journalist, if it is not deliberately, which can make quite different reading.
虽然文章来源于《卫报》——一个新闻业知名机构，如果不是刻意而为之，一些细微之处的错误还是会由于疏忽而发生。
How careless (it is) of him to make such a mistake!
他是不小心，才会犯下这种错误！
How careless (it is) of him to make such a mistake!
他是不小心，才会犯下这种错误！
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