名词
中文翻译：Unknown
同义词：
['varioscope', 'telescope with a variable focus', 'microscope with a variable focus']
例句：
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1. The variscope is used to magnify objects up close.
变焦镜用于放大物体。
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2. The astronomers used the variscope to observe the stars.
天文学家使用变焦镜观察星星。
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3. The variscope helped scientists to better understand the structure of DNA.
变焦镜帮助科学家更好地理解DNA的结构。