vi.流通；循环；传播
vt.使流通，使环流
Please open a window to allow the air to circulate. 打开窗子让空气流通。
Foreign money is not allowed to circulate in China. 外币不允许在中国流通。
Money shall circulate freely within the common market. 货币应在共同市场内自由流通。
Blood circulates through the body. 血液在体内循环。
