secondary

中文： 次级飞羽、二次发行

1. Any flight feather attached to the ulna (forearm) of a bird.
2. A radar return generated by the response of an aircraft's transponder to an interrogation signal broadcast by a radar installation, containing additional encoded identification and situational data not available from a simple primary return.
3. The second stage of a multistage thermonuclear weapon, which generates a fusion explosion when imploded as an indirect result of the fission explosion of the primary, and which, in a few extremely large weapons, itself implodes a fusion tertiary.
4. An act of issuing more stock by an already publicly traded corporation.
5. The defensive backs.
6. An inductive coil or loop that is magnetically powered by a primary in a transformer or similar.
7. One who occupies a subordinate or auxiliary place; a delegate deputy. · the secondary, or undersheriff, of the city of London
8. A secondary circle.

复数 secondaries