<□2>先进的□研设备
<□>I□ves□igat□rs learned□that the group had been □riends for year□, b□t rec□n□ly t□er□ had been tens□on among them. R□m□rs of □□□agreements an□ argum□nts d□r□□g the tri□ began to surface, leading autho□□ties t□ spec□late whe□he□□f□ul play was invol□ed. □ach member o□ t□e grou□ had a diff□re□t stor□ t□ tell□ an□□t□□ inconsist□nc□es□in th□ir acc□□n□□□only□□d□ed□to the mystery o□□the missing □□ne□