温床

(1)a situation that is ideal for rapid development (especially of something bad); "it was a hotbed of vice"

(2)急速な発展（特に悪いものの発展）に理想的な状態

(3)a place where animals breed

(4)動物が子どもを産む場所

(5)a bed of earth covered with glass and heated by rotting manure to promote the growth of plants

(6)植物の生育を促進するためにガラスで覆われ、腐食肥料によって熱せられた土の苗床