goal-line technology
noun [ U ] uk/ˌɡəʊl.laɪn tekˈnɒl.ə.dʒi/ us/ˌɡoʊl.laɪn tekˈnɑː.lə.dʒi/
球门线监控技术
electronic devices that show whether or not the ball has crossed the goal line in sports matches, used especially when it is not clear whether a player has scored a goal or not