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| "кельтский камень" | |||
| кельтский камень (A semi-ellipsoidal top which will spin on its axis in a preferred direction. But, if spun in the opposite direction, it becomes unstable, "rattles", stops and reverses its spin to the preferred direction slitely_mad) | |||
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rattleback : 1 短语, 1 学科 |
| 力学 | 1 |