小测验：选择正确的单词
ob [ɔb]
基本释义
英英解释
- a major river of western Siberia; flows generally northward and westward to the Gulf of Ob and the Kara Sea
[同]
ob, ob river - the branch of medicine dealing with childbirth and care of the mother
[同]
midwifery, ob, obstetrics, tocology
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