| 单词 | pendulum observation |
| 释义 | Definition of pendulum observation in English:pendulum observationnoun
OriginEarly 19th century; earliest use found in George Biddell Airy (1801–1892), astronomer. Definition of pendulum observation in US English:pendulum observationnoun
OriginEarly 19th century; earliest use found in George Biddell Airy (1801–1892), astronomer. |
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