A number of satellites are now <em>circling</em> the earth.
一些人造卫星现在正环绕地球飞行。
The plane was kept <em>circling</em> over the airport before landing.
飞机于降落前在机场上空持续盘旋。
Explorers in remote areas, ships at sea, even astronauts <em>circling</em> the earth axe able to keep in touch with civilization by means of radio.
到遥远地区探险的人们,在海上航行的轮船,甚至绕地球环行的宇航员们,都能借助无线电与有人居住的地方保持联系。