speculative trader

例句：

1. 1. The stock market is known for its speculative trading.
   股市以其投机交易而闻名。
2. 2. He invested in a speculative business venture.
   他投资了一个投机的商业项目。
3. 3. The company's strategy was based on speculative assumptions.
   公司的战略规划基于投机假设。