| 释义 |
M81 or M-81 may refer to: - M-81 (Michigan highway), a state highway in Michigan
- McDonnell-Douglas MD81
- Messier 81, a spiral galaxy in the constellation Ursa Major, also known as NGC 3031 or Bode's Galaxy
- U.S. Woodland, a camouflage pattern also known as "M81"
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