VOA慢速英语:'Ransomware' Affects Computers Worldwide

短语讲解：

1.Security experts are studying a computer software virus that has affected computers in at least 150 countries.

at least 至少
例句：He's been away for at least a week.
他走了总有一个星期吧。

2.Attackers used malware, which infects computers and takes control of user data. The infection encrypts the records and blocks use of computer files.

take control of 控制
例句：He failed in his attempt to take control of the company
他试图掌控公司，但以失败告终。

3.The malware used in the attack was said to be similar to a program stolen from the U.S. National Security Agency (NSA).

be similar to 与…相似; 类乎
例句：The scrapie agent in sheep may be similar to viroids.
绵羊的搔痒病因子可能也是类病毒。

4. But the agency reportedly developed the malware to be used for surveillance.

be used for 用来做…
例句：If low lands must be used for the bean crop, they should be ridged.
如果低地必须用于种植豆类作物，就必须把地整成交替的垄和沟。