Because light travels in a straight line through the contours of space-time, a light beam will curve where space-time curves, this curving was first measured in 1919.
因为光沿时空走直线，所以光线在时空弯曲的地方会弯曲。这现象在1919年首次被观测到。
The straight-edge diffraction of this parallel beam superposing on the light spot constitutes the so-called M-line.
这束平行光的直边衍射花纹与光斑本底叠加的结果在观察屏上形成为通常所称的M线。
When it's dark, in a vacuum, if a person shines a beam of light straight across your eyes, you won't see it.
当黑暗时，在真空中，如果有人将一束光直射进你的眼睛，你就看不见它。
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