Netizens are heatedly discussing the impact of this policy.
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Headline-friendly journalese — you'll see 引发热议 'sparks heated debate' constantly in news headlines, especially for Weibo trending topics.
usage
Often used as a noun-like result: 引发热议, 登上热议榜. The verb sense is somewhat formal; in casual chat people just say 大家在讨论 (dàjiā zài tǎolùn) 'everyone's talking about it.'