rollbackn.
英 'rəʊlbæk | 美 'rolbæk
中文n. 卷回；反转；（物价、利率等的）回降
词根词源
rollback (n.)also roll-back, "action of rolling backward," 1937; "reduction," 1942, American English, from verbal phrase, from roll (v.) + back (adv.).
关键词