A device or apparatus which rocks or is rocked in the manner of a cradle. A metal block or bar having one surface convex with a groove along its…
| 单词 | θ76203 |
| 释义 | the world > matter > physics > electromagnetic radiation > heat > transmission of heat > [noun] > vibration > instrument measuring (1) rocker1831 A device or apparatus which rocks or is rocked in the manner of a cradle. A metal block or bar having one surface convex with a groove along its… |
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