1.用作形容词，意为“在线的”“联网的”“联机的”等。

2. 用作副词，意为“在线”。如：You can book seats online.你可以在线预订座位。online短语：online help联机帮助；online community网络社区；online rumor网络谣言。online造句1、An online office mixer 2、Recently, she bought a gas heater online!3、Vista should be easier to update online.