五小时过后，这些猪被安置在一个新的测试环境中，而一个装着食物的碗被藏在障碍物后面。

After five hours with a mirror, the pigs were placed in a new test area that contained a food bowl hidden behind a barrier.

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从几何光学的观点出发，我们预期在不透明障碍物边缘的后面将得到明显清晰的阴影。

If we consider light from the point of view of geometrical optics, we would expect sharp, well-defined shadows to appear behind the edge of an opaque obstacle.

youdao

从几何光学的观点出发，我们预期在不透明障碍物边缘的后面将得到明显清晰的阴影。

If we consider light from the point of view of geometrical optics, we would expect sharp, well-defined shadows to appear behind the edge of an opaque obstacle.

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