逐年 + 动词
year by year; year on year
Structure
主语 逐年 增加／减少／上升／下降／扩大
What it means
'Year by year': a written adverb (逐, one after another, + 年) describing a steady trend over several years.
How it is built
Subject + 逐年 + verb of change (增加, 减少, 上升, 下降, 提高, 扩大, 增多): 放归以后，野外麋鹿的数量逐年增加 (Since the releases, the number of wild milu has risen year by year).
When to use it
Cousins: 逐步 (step by step), 逐渐 (1-5, gradually), 逐月, 逐日. The spoken equivalent is 一年比一年, which can also go with adjectives (一年比一年好).
Watch out
No bare adjective after 逐年: ✗逐年好 ✓逐年好转 (or 一年比一年好).
Examples
放归以后，野外麋鹿的数量逐年增加。
Since the releases, the number of milu in the wild has risen year by year.
随着出生率下降，这所小学招收的新生逐年减少。
As the birth rate falls, the number of new pupils the school takes in drops year by year.
近几年，来湿地看鸟的游客逐年增多。
In recent years the number of visitors coming to the wetland to watch birds has grown every year.
Learn this in Lesson 166 · HSK 7–9: 麋鹿回家 (The Père David’s deer comes home)
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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