A seedbed is an area of ground, usually with specially prepared earth, where young plants are grown from seed.
N-COUNT
(人或事物发展的)有利环境，温床
You can refer to a place or a situation as a seedbed when it seems likely that a particular type of thing or person will develop in that place or situation.
例句
TV is using radio as a seedbed for ideas...电视正从广播节目中汲取灵感。My region is a seedbed of crime.我所在的地区是犯罪活动的温床。