| 单词 | 焦点上 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔cross hair〕Either of two fine strands of wire crossed in the focus of the eyepiece of an optical instrument and used as a calibration or sighting reference.十字丝：呈十字形交叉于光学仪器的目镜焦点上的两根细丝之一，用于校准或瞄准参考美国传统〔defocus〕To cause (a beam or a lens) to deviate from accurate focus.（使）散焦：使（一束光或一个透镜）从准确的焦点上偏散开来美国传统〔focal〕Placed at or measured from a focus.焦点上的：设置在焦点上的或从焦点处测量的美国传统 |
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