Although the dark triad personality type appears to be universal in human society, having been identified in 57 countries, it does exact real costs - otherwise bad boys would be more common.

虽然黑暗人格在人类社会中广泛存在，已经在57个国家得到确认，不过那可不是易如反掌轻松惬意的——否则坏男孩们就能满天飞了。

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While the exact causes of the disease are not known, several risk factors have been identified.

虽然这种疾病的确切原因尚不清楚，一些风险因素已经确定。

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It was identified as a key player in pluripotency in 2003, but until now its exact biological role remained unclear.

它于03年被确定为维持干细胞多能性的一个关键分子，但是至今它确切的生物功能还不清楚。

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Neither the Canadian authorities nor King identified the exact route of the targeted train.

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They still haven't identified the exact chemical.

WSJ: Unraveling the Riddle of Too Much Sleep

The FAA announcement comes on the same day the National Transportation Safety Board told reporters it had identified the exact battery cell that first short-circuited on a plane in Boston in early January, but still had not determined the root cause of the electrical short.

CNN: Boeing can conduct Dreamliner test flights