go off at a tangent

go off at a tangent是什么意思、go off at a tangent怎么读
(说话时)突然扯到题外, 突然背离原来的途径, 突然改变行径/思想

go off at a tangent汉语翻译

(说话时)突然扯到题外, 突然背离原来的途径, 突然改变行径/思想