With the existing research result, we have studied about it from three angles.
结合前人已有研究成果，从三个不同角度探讨“先生”称谓。
When the incident Angle is around the three angles, the lateral shift is very large.
当入射角在这三个角附近时，横向偏移变得非常大。
When the incident Angle is around the three angles, the lateral shift is very large.
当入射角在这三个角附近时，横向偏移变得非常大。
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