1:550航母模型合金,山东军舰仿真,中国海军金属超大成品摆件。 1:550 aircraft carrier model alloy, Shandong warship simulation, Chinese navy metal oversized finished ornaments. ... https://www.youtube.com/watch?v=k-yPcBRuGKA
永动机永动摆件,转动摆杆高档商务礼品,家居牛顿摆撞球。
Perpetual motion ornaments, high-end business gifts with rotating pendulum rods, and home Newton pendulum billiard balls.
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https://www.youtube.com/watch?v=P8YLd75PFCc