On Wednesday came a fourth attack, a Ukrainian man with leg wounds believed to have been caused by a shark.

周三发生了第四次袭击，一位腿部受伤的乌克兰人据信也是拜鲨鱼所赐。

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The seizure of the Blida was the fourth attack on New Year's Day; the other three were unsuccessful, thanks to evasive action and other protective measures.

MV Blida号被劫持是2011年的第一天海盗对货船的第四次袭击。多亏货船的规避行动和船上其他保护措施，其他三次都没有成功。

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The resulting rate of escalation would place the third attack approximately 2 months (66 days) after the second, with the fourth an estimated 52 days after that.

逐步上升的发生概率将大致得出第三次袭击会在第二次袭击的2个月（66天）后发生，而约52天后会发动第四次袭击。

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This was the fourth attack by extremist groups on Minhas alone.

ECONOMIST: Banyan

From a medical perspective, the news last week that he had suffered a fourth heart attack wasn't all that surprising.

CNN: Just How Bad Was It?

Hagel also suggested that the Pentagon's five-year budget plan continues to plan for additional F-22 Raptor fighter jets and F-35 Joint Strike Fighters in the region, along with a fourth fast-attack submarine deployed to Guam.

NPR: Hagel Warns China On Cyberattacks