Mostly, he sits in a wheelchair, crippled by brittle bone disease.

由于脆骨病致残，他大多数情况下坐在轮椅上。

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This makes the bone become very brittle and easier to fracture.

这使得整体骨骼变得非常脆弱，而且容易骨折。

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This makes the bone become very brittle and easier to fracture.

这使得整体骨骼变得非常脆弱，而且容易骨折。

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