切向焦點(diǎn)正切焦點(diǎn)focus: n. (pl. focuses, foci ) 1.【物 ...tangential ray focus: 切向光線聚點(diǎn)tangential: 表面的; 扯遠(yuǎn)的; 膚淺的; 離題的; 偶然的; 切線的切向的; 弦切面的; 相切的; 相同的; 沿切線的; 正切的切線的be focus: 要專心be in focus: 清楚的下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯