对等原则（权利）

reciprocity
～是外交事务中的一项重要原则。Reciprocity is an important principle in diplomacy.

• oral contraceptive
• oral history
• oral surgery
• oran
• orange
• orange free state
• orangemen
• orange order
• orange river
• orange，house of
• orangutan
• orant(e)
• oraon
• oration
• orator
• oratorians
• oratorio
• oratory
• orb
• orbed
• orbit
• orbital
• orbs
• orb weaver
• orcagna，andrea