下的英語翻譯：

below; descend; down; give birth to; give in; go to; leave off; lower; next
take
【醫(yī)】 cata-; hyp-; infra-; kat-; sub-

關節(jié)的英語翻譯：

articulation; joint; key links
【醫(yī)】 arthr-; arthro-; arthron; article; articulatio; articulation
articulationes; articuli; articulus; artus; joint; junctura; syntaxis

凹的英語翻譯：

concave; dent; fovea; hollow
【醫(yī)】 concavity; depression; faveoli; faveolus; fossa; fossae; fovea; hollow
koilo-; lenus; pit; sink; venter