It is well known that a light spot of sub-wavelength will diverge in all directions.
众所周知，一个次波长光斑将向各个方向发散。
Accurate position information is obtained independent of the light spot intensity profile, symmetry or size.
获得精确的位置信息的同时不依赖于光斑强度、形状、对称性或尺寸。
In fact, when people look directly at the Sun, the strong light in the middle of the Sun is like a light spot.
原来人们直视太阳的时候，太阳中间强烈的光线，就像一个亮点。
In fact, when people look directly at the Sun, the strong light in the middle of the Sun is like a light spot.
原来人们直视太阳的时候，太阳中间强烈的光线，就像一个亮点。
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