circulationn.
英 sɜːkjʊ'leɪʃ(ə)n | 美 ,sɝkjə'leʃən
中文n. 流通，传播；循环；发行量
词根词源
circulation (n.)mid-15c., from Middle French circulation or directly from Latin circulationem (nominative circulatio), noun of action from past participle stem of circulare "to form a circle," from circulus "small ring" (see circle (n.)). Used of blood first by William Harvey, 1620s.
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