A button can be made of bone, wood, glass, or plastic.
扭扣可以用骨头、木头、玻璃或塑料制成。
And (3) What's the effect of overlying bone on glass fragment?
以及(3)摄影时重叠的骨骼会有甚么影响？
A button can be made of bone, wood, glass or plastic.
钮扣可以用骨头、木头、玻璃或塑料制成。
A button can be made of bone, wood, glass or plastic.
钮扣可以用骨头、木头、玻璃或塑料制成。
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