| 单词 | parallel rays |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔emmetropia〕The condition of the normal eye when parallel rays are focused exactly on the retina and vision is perfect.屈光正常：当平行光线恰好聚焦于视网膜并形成清晰视觉时正常眼睛的状态美国传统〔searchlight〕An apparatus containing a light source and a reflector for projecting a high-intensity beam of approximately parallel rays of light.探照灯：包括光源和用来投射近乎平行的高强度光束的反光镜的器具美国传统 |
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