名词
中文翻译：失焦的透镜
同义词：
['blurred lens', 'out-of-focus lens']
例句：
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1.The photographer focused his lens on the distant mountain.
摄影师将镜头对准远处的山。
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2.The old camera lens was so dirty that it couldn't focus properly.
旧相机的镜头太脏了，无法正常聚焦。
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3. The scientist used a defocused lens to study the structure of the crystal.
科学家使用一个失焦的透镜来研究晶体的结构。