Tian
(
天
)
Tian
(
天
)
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Vocabulary
HSK 7–9 ②
Day 21
必不可少
New
必不可少
必不可少
b
ì
b
ù
k
ě
sh
ǎ
o
indispensable, absolutely essential
set phrase
Again
1
Hard
2
Good
3
Easy
4
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