朝鲜从韩国窃取军事文件

hackers – n. a person who secretly gets access to a computer system to cause damage or steal information

data center – n. a place were computers used to store large amounts of information are kept, maintained and secured

contingency – n. something that might happen including an emergency or unusual event

facilities – n. buildings or equipment used for a certain purpose

confident – adv. to be sure about something