Bilingual edition: English is preserved and Chinese follows each unit. Terminology uses the confirmed v20260916 glossary; automated semantic review remains traceable.
中英双语版：英文原文完整保留，中文紧随对应单元；术语采用 v20260916 确认表，自动语义审校结果可追溯。

Diffraction

衍射

Diffraction manifests itself in the apparent bending of waves around small obstacles and the spreading out of waves past small openings.

衍射表现为波围绕小障碍物的明显弯曲以及波通过小孔后的扩散。
Diffraction reveals the geometry of the diffracting object.
衍射揭示了衍射物体的几何形状。
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HyperPhysics***** Light and Vision
HyperPhysics ***** 光与视觉
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