“spatial frequencies”的概念、定义、翻译、参考文献-科学参考

单词	spatial frequencies
释义	spatial frequencies Encyclopedia 理学人的导航释 spatial frequencies空间频率 1度视角内明暗条纹重复出现的周期数，即明线和暗线的对数。单位是周/度，写作c/d。
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