pipe heated hotbed

例句：

1. 1.The scientist used a hotbed to grow the seeds.
   科学家使用一个热床来培育种子。
2. 2.The new technology is a hotbed for innovation.
   这项新技术是创新的温床。
3. 3.The hotbed of research has led to many breakthroughs.
   研究热床导致了许多突破。