Although it looks fierce, the dog has never bitten anyone. -< Fierce ......... giải thích nữa ạ

Although it looks fierce, the dog has never bitten anyone. 
⇒ Fierce as/though the dog looks, it has never bitten anyone

Cấu trúc: Tính từ/ trạng từ/ danh từ + as/ though ...: mặc dù/dù...