INSTabbr.立刻；瞬时（=instant）abbr.学院（=institute）instable patella髌骨不稳instalation item安装项目instable failure失稳破坏Institut Pasteur巴斯德研究所instictive action本能的动作Instamatic camera即拍即印照相机instaneous adj.瞬间的；instation circuit站内电路instrusion detect入侵检测instlated tubular隔热管