speculative boom

例句：

1. 1. The stock market experienced a speculative boom in the early 2000s.
   21世纪初股市经历了一次投机性繁荣。
2. 2. This company's growth was driven by a speculative boom in renewable energy technologies.
   该公司的增长得益于可再生能源技术领域的投机性繁荣。
3. 3.The rise of e-commerce during the pandemic led to a speculative boom in online retail.
   疫情期间电子商务的兴起导致了在线零售的投机性繁荣。