本期内容：

International investigators are hunting for those behind an unprecedented cyber-attack that affected systems in dozens of countries, as security experts sought to contain the fallout. The assault, which began Friday and was being described as the biggest-ever cyber ransom attack, struck state agencies and major companies around the world--from Russian banks and British hospitals to FedEx and European car factories.

Unprecedented：史无前例的
Cyber-attack：网络攻击
Contain：控制
Fallout：后果
Assault：攻击
Ransom：赎金

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