直至 zhízhì lasting until
lasting until; up till (the present)
How to remember 直至: 直 straight + 至 until = lasting until.
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How it is used
- A formal 'up until / all the way to' - 会议直至深夜才结束 (huìyì zhízhì shēnyè cái jiéshù) the meeting didn't end until deep into the night.
- More written than 直到 (zhídào), which is the everyday equivalent; 直至 shows up in reports and formal timelines.