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单词 双焦
例句 DEFINITIVE EXAMPLES 权威例句〔bifocal〕Having two focal lengths.双焦距的美国传统〔think〕No one before had thought of bifocal glasses.以前无人想象双焦点眼镜美国传统〔trifocal〕The majority of older people need bifocal or trifocal lenses.大多数老年人都需要双焦点或三焦点镜片。外研社新世纪
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