Setting up the ideal model is a common approach to the problems in physics.
构建理想化模型是处理物理问题常用的方法。
Communication equipment, medical equipment, sports equipment, digital electronics, is the ideal common device.
通讯设备、医疗器材、运动设备、数码电子，是理想的终端常用器件。
Communication equipment, medical equipment, sports equipment, digital electronics, is the ideal common device.
通讯设备、医疗器材、运动设备、数码电子，是理想的终端常用器件。
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