obligatoryadj.强制性的;义务的;必须的
obligatory self-insurance固定自保部分
obligatory presentation copy纳本
obligatory parasitic bacteria专性寄生菌
obligatory anaerobic bacteria专性嫌气细菌
obligatory water reabsorption被动性水重吸收
obligatory eccentric fixation强迫性偏注视
obligatory character provision强制性规定
obligatory judicial settlement强制司法解决
obligatory aerobic respiration专性有氧呼吸
obligatory annual contribution每年度必须交纳的会费