名词短语
中文翻译：棱镜的底面
同义词：
['prism base', 'prism bottom']
例句：
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1. Thescientist used a prism to analyze thelight waves.
科学家使用棱镜来分析光波。
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2. The prism was placed atthe correct angle to observe the spectrum.
棱镜被放置在正确的角度以观察光谱。
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3.The prism was used to separate differentcolors of light.
棱镜被用来分离不同颜色的光。