温床

zhè xiē shì fàng zài wēn chuáng zhòng jīng shòu nài hán duàn liàn de yòu miáo

这些是放在温床中经受耐寒锻炼的幼苗。

These are the seedlings that are hardening off in a hotbed.

hǎi yáng shì péi yù yuán shǐ shēng mìng de wēn chuáng

海洋是培育原始生命的温床。

The sea is the breeding ground for the primitive living organisms.