v.走向岔道；離開本題；扯到枝節(jié)上
I'll tell you a funny story,if I may digress for a moment. 如果我可以暫時離開一下話題，我將講一個有趣的故事給你聽。
Don't digress from the subject when lecturing. 講課時不要扯到枝節(jié)上。
