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to hand down (formula) secretly
☊
bí truyền
☊
深奥
→
☊
shen1ao4
profound; abstruse; recondite; profoundly
☊
Bí truyền
☊
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like: bí truyền
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to hand down (formula) secretly ☊ 
bí truyền ☊ 
深奥 → ☊ shen1ao4 profound; abstruse; recondite; profoundly ☊ Bí truyền ☊