爱管闲事
发表于 2025-3-28 15:06:21
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Middle-Ear
发表于 2025-3-28 21:09:01
itate the study and understanding of the real phenomenon. The model may be easier to see, nearer by, or less dependent on time, relative to the real phenomenon. A shipbuilder may make a small-scale model of a ship he intends to build. In this case the real phenomenon does not as yet exist but many p
被诅咒的人
发表于 2025-3-28 22:58:59
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