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。
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。
It's careless of you to make such a mistake.
你犯这样的错误真是粗心。
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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