Very little light filters through the canopy of leaves and branches in a rain forest to reach ground level—or close to the ground—and at those levels the yellow-to-green wavelengths predominate.

在雨林中，很少有光透过树叶和树枝形成的树荫到达地面——或者接近地面——在这些高度上，黄色到绿色的波长占主导地位。

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Health physicists knew that workers at ground level would be exposed to radiation from buried materials and to radiation emanating from the shelter.

但健康物理学家清楚，这样会使地面上的工人们暴露在掩埋核原料和遮蔽建筑本身散发的辐射之中。

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He plans to add regenerative capabilities to the exoskeleton, so that it will require little or no power when moving on level ground.

他计划要为外骨骼添加再生能源的能力，使得平地的运行能耗损很少能源或甚至不耗损能源。

youdao

So if we go to the ground state, what you see is we're at that lowest energy level, and we only have one possibility for an orbital, because when n equals 1, that's all we can do.

如果我们在基态上，你可以看到，我们在能量最低的态上，只有一种，可能的轨道，因为n等于1，只有这种可能。

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