| 单词 | 外缘 |
| 释义 | 〔focus〕To render (an object or image) in clear outline or sharp detail by adjustment of one's vision or an optical device; bring into focus.使集中于焦点：通过调节视力或光学仪器使（一物体或图象）外缘清晰或细节分明；调焦〔extrados〕The upper or exterior curve of an arch.拱背线：拱顶上面或外缘的曲形线〔grave〕Of or referring to a phonetic feature that distinguishes sounds produced at the periphery of the vocal tract, as in labial and velar consonants and back vowels.抑音的：属于或关于一种语系特征的，可通过在元音带外缘产生的声音区别， 如在唇音、软腭辅音和后元音里 |
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