单词	ulna
释义	ulnaulna /ˈʌlnə/ noun [countable] Etymology ETYMOLOGYulna Origin: 1500-1600 Modern Latin Latin, elbow science, biology the inner bone of your lower arm, on the side opposite to your thumb
随便看	back story backstreet backstretch backstroke backtalk back-to-back backtrack backup backward backwardly backwardness backwash backwater backwoods backwoodsman backyard bacon Bacon, Francis Bacon, Sir Francis Bacon's Rebellion bacterial bacteriological bacteriologist bacteriology bacteriophage

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