Investigators: Missile That Hit Malaysian Airliner in 2014 Came from Russia(翻译)

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board – n. a group of people who have been chosen to learn information about something, to give advice, etc.

spokesman – n. someone who speaks for or represents a person, company, etc.

clear-cut – adj. free from doubt or uncertainty; very definite

aircraft – n. a machine (such as an airplane or a helicopter) that flies through the air