Ko
(
コ
)
tsu
(
ツ
)
Ko
(
コ
)
tsu
(
ツ
)
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Vocabulary
N1
Day 48
退化
New
退化
退化
たいか
degeneration, atrophy
noun
Sino-Japanese
Lv.5
Again
1
Hard
2
Good
3
Easy
4
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