单词学习：circumferential Adjective (形容词)
circumferential
/sərˌkʌmfəˈrenʃəl/
adj. 周围的，环绕的；圆周的
The circumferential measurement of the ancient tree trunk, taken by 顾老师, was over five meters.
顾老师测量的这棵古树树干的周长超过了五米。
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