We have explained this being due to light in the red spectrum bending readily, so red light is bent first over the horizon by the gravity of Earth where light in the other spectrums is not so bend.
我们解释过这是由于红色光谱更容易弯曲，所以当其他光线还没怎么样时，红光首先由于地球的引力而沿着地球的曲线弯曲。
P The minimum diameter to which a bar is bent shall be such as to avoid bending cracks in the bar, and to avoid failure of the concrete inside the bend of the bar.
弯曲钢筋的最小直径处应避免弯曲裂缝，并避免在弯曲位置的钢筋混凝土破坏。
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