| 释义 |
tan·gentBrE /ˈtændʒənt/ NAmE /ˈtændʒənt/ noun (geometry几何) a straight line that touches the outside of a curve but does not cross it 切线 (abbreviation tan ) (mathematics数学) the ratio of the length of the side opposite an angle in a right-angledtriangle to the length of the side next to it 正切 ➡ compare cosine, sine ● fly /go off at a ˈtangent (BrE ) (NAmE go off on a ˈtangent ) (informal ) to suddenly start saying or doing sth that does not seem to be connected to what has gone before 突然转换话题；突然改变行动 |