A tortoise which is losing weight to the extent that it is approaching the danger line should be taken out of hibernation and artificially sustained for the remainder of the winter.

如果一只龟的体重减轻，正在接近危险范围，那么就应该让它结束冬眠，在余下的冬季里进行人工供养维持。

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He's got to come forward and take the danger and take the blows and close the line.

他必须涉险向前,冒着枪林弹雨,去填补这一排的空缺

耶鲁公开课 - 古希腊历史简介课程节选

Another possibility would be alarms that sound when someone crosses the yellow danger line.

WSJ: NYC subway safety options discussed

Back came the hosts and they came close to an equaliser soon after the interval as Samba nodded on a long throw and would have found the net had it not been for the well-positioned substitute Yuri Zhirkov, who cleared the danger from the line.

BBC: El-Hadji Diouf celebrates his equaliser

He lofted an effort towards goal with the Mexico keeper stranded out of position, but Francisco Javier Rodriguez was perfectly positioned on the line to clear the danger.

BBC: England 3-1 Mexico