revolving nosepiece
/ɹɪvˈɒlvɪŋ ˈnəʊzpiːs/
n
English · revolving nosepiece中文 · 换镜旋座Español · portaobjetivo rotatorioFrançais · tourelle porte-objectif
意味：Rotating plate to which objectives of different powers are fixed to allow them to be used in succession during a study.