a on a regular route of a railroad or bus or airline system
a connected to a computer network or accessible by computer
s being in progress now
[计] 联机
1. I like to shop online for clothes.
我喜欢在线购买衣服。
2. She took an online course to improve her skills.
她参加了一个在线课程来提高自己的技能。
3. We can meet online for the meeting tomorrow.
我们可以在线开会，明天见。