名词

1.[C,U]血液循环

2.不可数名词：流传，传播；流通

3.可数名词：报纸、杂志等售出的份数，发行额，销售量

英语解释

(library science) the count of books that are loaned by a library over a specified period

movement through a circuit; especially the movement of blood through the heart and blood vessels

number of copies of a newspaper or magazine that are sold

the spread or transmission of something (as news or money) to a wider group or area

free movement or passage through a series of vessels (as of water through pipes or sap through a plant)

the dissemination of copies of periodicals (as newspapers or magazines)