adverbformal or old-fashioneduk/ˌðeəˈbaɪ/us/ˌðerˈbaɪ/
C1因此，由此;从而
as a result of this action
Diets that are high in saturated fat clog up our arteries, thereby reducing the blood flow to our hearts and brains.高饱和脂肪和高胆固醇的饮食容易阻塞我们的动脉，从而减少向心脏和大脑的供血。
Idiom
thereby hangs a taleidiomhumorous说来话长，其中大有文章
said to someone when what they have asked about involves a long explanation
"Why are you limping?" "Ah, thereby hangs a tale."“你为什么一瘸一拐的？”“唉！说来话长。”