gyroscope
noun /ˈdʒaɪrəskəʊp/
  /ˈdʒaɪrəskəʊp/
 (also informal gyro 
 /ˈdʒaɪrəʊ/
  /ˈdʒaɪrəʊ/
)- a device consisting of a wheel that turns rapidly inside a frame and does not change position when the frame is moved. Gyroscopes are often used to keep ships and aircraft steady.陀螺仪;回转仪 词源mid 19th cent.: from French, from Greek guros ‘a ring’ + modern Latin scopium, from Greek skopein ‘look at’.