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历史:
CET-4 CET-6 考研 TOEFL IELTS BNC: 6151 COCA: 5497
optical
op·ti·cal / 5BptIkl ; 5RptIkEl /adjective
1. relating to machines or processes which are concerned with light, images, or the way we see things光学的:
microscopes and other optical instruments 显微镜和其他光学仪器
optically / -klI ; -kli / adv.

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