Flash sale, only while it lasts — snooze and lose!
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Everywhere in marketing copy: 限时优惠 (limited-time offer), 限时免费 (free for a limited time), 限时抢购 (flash sale). The urgency framing — pair with 仅剩 (jǐn shèng, only X left) or 倒计时 (dàojìshí, countdown) — is standard e-commerce technique.