The relation between hoop strain and radius-directional pressure was set up based on the theoretics of mechanics of materials.

根据材料力学理论建立了活塞环环向应变与径向压力之间的关系式。

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If there's a second hoop in the room, they can be set to hoop A and B to tally scores for two different players on the same device.

ENGADGET: NERF Cyberhoop hands-on: foam basketball for the iPad generation