| 单词 | P.Z. exercise |
| 释义 | Definition of P.Z. exercise in English:P.Z. exercisenoun
OriginEarly 20th century. From the P and Z signalling flags: see quot. 1962. Definition of P.Z. exercise in US English:P.Z. exercisenoun
OriginEarly 20th century. From the P and Z signalling flags: see quot. 1962. |
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