单词	trackball
释义	trackball /ˈtrakbɔːl / (also tracker ball) noun A small ball that is set in a holder and can be rotated by hand to move a cursor on a computer screen.Other features tailored to the gaming community include the trackball interface, which not only supports trackballs and spinners, but also has three mouse buttons as well.... The scroll control comes from a ball built into the upper surface of the mouse - a kind of modern answer to the trackballs of old. A trackball is stationary and the pointer can be moved using your thumb by rolling the ball which sits on the top.
随便看	unioner Unione Siciliana Unione Siciliane Unione Siciliano Unione Sicilione Union flag union government union grass union hall union hours unionid unioniform unionise unionised unionism unionist unionistic unionization unionize unionized Union Jack Union Jackery Union Jackist union joint union label

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