Scientists have nicknamed them the "deadly dozen" : 12 diseases, lethal to humans and wildlife, that are increasing their geographical range.

科学家为对人类和野生动物均足以致命的12种疾病起了“12杀手”的绰号，它们的地域范围正在逐步扩大。

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Changes in rainfall patterns and temperatures were known to have an effect, though the reason was not always clear, he said at the launch of the report, the Deadly Dozen.

他在发表名为“12杀手”的报告时说，降雨模式和温度的变化的影响已经为人所知，虽然原因尚不清楚。

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Upon entering Shimrra's throne room, they were beset by over a dozen deadly Slayers.

他们一进入王座室，就被十几名骁勇的屠戮兵团团围住。

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Over the past month, more than a dozen militants were arrested throughout Yemen, including prime suspects behind deadly suicide attacks against government forces.

CNN: Yemen on high alert after al Qaeda threatens prison break

Though a few dozen are currently on death row, the supreme court's judges are too frightened of a deadly reprisal to hear their appeals.

ECONOMIST: Islamist militancy is alive and well