1、手臂英语：Arm，英 [ɑːm] 美 [ɑːrm]。
2、放开我的手臂——你把我弄痛了！Leave go of my arm ─ youre hurting me!
3、海豹的鳍肢与人类的手臂同源。The seals flipper is homologous with the human arm.
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