hotbed

詳細解釋：

hot.bed

n.（名詞）
An environment conducive to vigorous growth or development, especially of something undesirable:
犯罪的溫床：（尤指）有利於令人憎惡的事物迅速滋生或發展的環境：
例句：
a hotbed of intrigue.
陰謀的溫床

A glass-covered bed of soil heated with fermenting manure or by electricity, used for the germination of seeds or for protecting tender plants.
溫床：有草覆蓋的土層，通過發酵肥料或通電加熱，用於種子的發芽或保護植物幼苗