【计】 辅助控制器secondary controller
超二级结构super-secondary structure
次生鳃secondary branchia
第一、二、三产业primary, secondary and tertiary industries
次极精母细胞secondary spermatocyte
次生演替系列secondary sere
腹壁缝合裂开剜脏术，第二次缝合Suture of abdominal wall for evisceration of dehiscence for secondary closure
次生演替secondary succession