double-jointed
adjective uk/ˌdʌb.əlˈdʒɔɪn.tɪd/ us/ˌdʌb.əlˈdʒɔɪn.t̬ɪd/
(关节)能前后弯曲的;有双关节的
able to move your joints in an unusual way so that, for example, you can bend your fingers or legs backwards as well as forwards
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