一改…
to completely change; to break with (a former state)
Structure
主语 一改 （往日／以往／过去的）旧样子
What it means
To change completely, breaking at one stroke with a former state. 一 means “at one stroke, completely”; the object is the old state being left behind.
How it is built
Subject + 一改 + (往日／以往／过去的) + old state: 这座老城一改往日的冷清 (the old town has shaken off its former quiet). The new state often follows: …，变得热闹起来.
When to use it
Written style, common in news and reviews: 一改往日的冷清, 一改以往的做法. In speech say 跟以前完全不一样了.
Watch out
Put the old state after 一改, not the new one. ✗ 一改热闹 ✓ 一改往日的冷清，变得热闹起来.
Examples
舞蹈《只此青绿》一改人们对古画安静、遥远的印象。
The dance Only This Green swept away the idea of old paintings as quiet and remote.
这座老城一改往日的冷清，一到晚上到处都是游人。
The old town has shaken off its former quiet; in the evenings it is full of sightseers.
新馆长上任后一改过去的做法，让观众在网上预约参观。
The new director broke with past practice on taking over and had visitors book online.
Learn this in Lesson 93 · HSK 6–7: 两幅北宋长卷 (Two Northern Song scrolls)
A dialogue, a reading, word cards with audio and a drill that uses it, in Learn Chinese with Bao. The first lessons of every level are free.
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