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单词 shadow
释义 shadow
[`shad·ō]
OPTICS
A region of darkness caused by the presence of an opaque object interposed between such a region and a source of light.
PHYSICS
A region which some type of radiation, such as sound or x- rays, does not reach because of the presence of an object, which the radiation cannot penetrate, interposed between the region and the source of radiation.
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