concentric
/kənˈsɛn.tɹɪk/ 形容词 C2中文： （圆）同心的
- Having a common center.
- Of a motion, in the direction of contraction of a muscle. (e.g. the extension of the lower arm by means of the elbow joint while contracting the triceps and other elbow extensor muscles; closing of the jaw while flexing the masseter).
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