Finding tetrachromats through genetic screening is one thing. Proving they can see tens of millions of additional colors is another.
通过基因筛选找到四色视者是一回事，证明她们可以看到千万种更多的色彩则是另一回事。
Carrying through on promises is proving far harder than making them.
事实证明，履行承诺比许下承诺是困难很多的。
A thick screen had been placedbetween his cathode emitter and the radiated cardboard, proving that particlesof light were passing through solid objects.
当时，他在阴极发射器与被辐射的纸板之间放置了一道厚厚的屏障，说明光的粒子穿过了固态物体。
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