在线 zàixiàn online
online; connected to the Internet; (figuratively) (colloquial) (of a person) mentally focused; engaged; (of skills, performance etc) sharp; on point; functioning at a high level
How to remember 在线: 在 at + 线 line = online.
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How it is used
- 在线 (zàixiàn) is the standard word for "online" in technical/formal contexts: 在线客服 (zàixiàn kèfú, online customer service), 在线学习 (zàixiàn xuéxí, online learning).
- In casual speech, 网上 (wǎngshàng, on the internet) is more common - 在线 sounds slightly more technical or written, like in app UI text or business terms.
- It has picked up a newer figurative slang sense: 状态在线 or just 在线 describing a person as sharp, engaged, or performing well - 今天状态很在线 (in top form today).
- As an adjective it usually sits before a noun (在线支付, online payment) rather than as a standalone predicate.