Tian
(
天
)
Tian
(
天
)
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Vocabulary
HSK 7–9 ②
Day 28
瓶颈
New
瓶颈
瓶颈
瓶頸
p
í
ngj
ǐ
ng
bottleneck (obstacle), neck of a bottle
noun
Again
1
Hard
2
Good
3
Easy
4
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