名詞 digression:

1. a message that departs from the main subject
   同義詞：aside, excursus, divagation, parenthesis
2. a turning aside (of your course or attention or concern)
   同義詞：diversion, deviation, deflection, deflexion, divagation
3. wandering from the main path of a journey
   同義詞：excursion

1. A comment departing from the theme of discourse; a digression.
   插話，插曲，穿插與討論的主題無(wú)關(guān)的看法; 離題話，
2. The direct address of an absent or imaginary person or of a personified abstraction, especially as a digression in the course of a speech or composition.
   呼語(yǔ)直接稱呼不在場(chǎng)或虛構(gòu)的人物或稱呼擬人的事物，尤指作為演講或作文過(guò)程中的離題話

di.gres.sion

n.（名詞）
The act of digressing.
離題：離題的行為
An instance of digressing, especially a written or spoken passage that has no bearing on the main subject.
離題段落：離題的例子，特別是指寫作或演說(shuō)中與主題無(wú)關(guān)的段落

【引伸】
digres.sional
adj.（形容詞）