Tian
(
天
)
Tian
(
天
)
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Vocabulary
HSK 7–9 ③
Day 29
约定俗成
New
约定俗成
约定俗成
約定俗成
yu
ē
d
ì
ng-s
ú
ch
é
ng
established by usage, accepted by social convention
idiom
Again
1
Hard
2
Good
3
Easy
4
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