abbr. 随机阻塞系统（Random Barrage System）；雷达信标系统（Radar Beacon System）；雷达标定弹着点（Radar Bomb Scoring）；英国皇家雕塑家协会（Royal Society of British Sculptors）；核糖体结合位点（Ribosomal Binding Site）
n.a soft silvery metallic element of the alkali metal group; burns in air and reacts violently in water; occurs in carnallite and lepidolite and pollucite