股票买卖

例句：

1. 1. I want to buy some stocks for my retirement fund.
   我想买一些股票作为我的退休基金。
2. 2. The stock market is highly volatile, so it's important to do your research before investing.
   股市波动很大，所以在投资前一定要做好研究。
3. 3. He decided to invest in a startup company after analyzing the market trends.
   他在分析了市场趋势后决定投资一家初创公司。