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"Translation-Dictionary.net" is the most comprehensive free online dictionary available on the web. It well exceeds regular dictioanries in terms of vocabulary coverage and it translates hundreds of thousands of words, phrases, and sentences between multiple languages. It includes translations for a wide varierty of domains such as proper names, technical terminologies, movie titles, etc. It also offers pronunciation, related terms, synonyms, spelling correction, and example sentences.

光学共振器 optical resonator
光学共振腔 optical cavity
光学分析 optical analysis
光学印刷 projection printing
光学印刷机 optical printer
光学取样 optical sampling
光学唱机 optical sound reproducer
光学器械 optical instrument
光学图像 optical image
光学处理 photoprocess
光学安培计 optical ammeter
光学家 opticist
光学容限 optical tolerance
光学导航 optical guidance
光学工具 optical tooling
光学工具尺 optical tooling scale
光学工具轴 optical tooling bar
光学干涉 optical interference
光学录音 optical sound recording
光学录音机 photographic sound recorder
光学影像 optical image
光学性能 optical property
光学性质 optical property
光学成像 optical imagery
光学扫描 optical scan
光学投影 optical projection
光学投影仪 optical projector
光学投影比较仪 optical projection comparato...
光学捕获 optical trapping
光学显微镜 light microscope
光学望远镜 optical telescope
光学材料 optical material
光学比较仪 optical comparator
光学测距 the optical measurement of d...
光学测距仪 telemeter
光学测量 optical measurement
光学玻璃 optical glass
光学玻璃纤维 optical glass fibre
光学系数 optical coefficient
光学纤维 light guide
光学纤维元件 fibre optic element
光学纤维束 fibre bundle
光学纤维波导 optical fibre waveguide
光学纤维通信 optical fibre communication
光学薄膜 optical thin film
光学薄膜元件 optical thin film element
光学薄膜器件 device of optical film
光学谐振腔 optical resonant cavity
光学跟踪 optical tracking
光学跟踪卫星 optical tracking satellite
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