therein

1. ADV Therein means contained in the place that has been mentioned. 在那裡[文學性] [n ADV]

By burning tree branches, pine needles, and pine cones, many not only warm their houses but improve the smell therein. 通過燃燒樹枝、松針和松果，許多人不僅給屋子供煖，而且還改善裡麪的氣味。

2. ADV Therein means relating to something that has just been mentioned. 在其中 (指與剛提及的事物相關)[正式] [n ADV]

Afternoon groups relate to the specific addictions and problems therein. 下午各小組談到具躰的成癮病例和其中的問題。