That is a necessary but not a sufficient condition, as the type of rock involved, called carbonaceous chondrite, is found in other asteroids, too.

他有两方面的证据：第一，现存的灾难性撞击的残骸与Baptistina和她的后代有相同的成分，这是必要条件，但并非充分条件，因为含碳的球粒状陨石在其它小行星上也有；

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An exception is a signal that some sort of exceptional condition, such as a "file not found" error, has occurred.

异常像是一种异常情况时软件发出的信号例如“File not found”错误的发生。

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I was found to have a congenital heart condition, and I felt myself hitting rock bottom as I couldn't even complete 10 minutes of the cardio stress test I took that day.

那天当我甚至不能完成十分钟的心脏压力测试的时候，我感觉自己坠入谷底——我被检查出有先天性心脏病。

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Film companies try to leave a home in the same condition as they found it--or better.

FORBES: Home Movies

Often described as "winter blues", Rosenthal found the condition was more prevalent in northern latitudes: virtually no-one in sunny Florida was diagnosed with the condition while almost one in 10 of the population further north in New Hampshire was said to suffer from SAD.

BBC: Does sunshine make us happier?