middle and smamll investors的用法和样例：
例句
- Particularly in some type of office building sales, Class B concept confusion, the small investors are easily misled.
尤其在一些销售型办公楼中，甲级乙级概念混淆，易使中小投资者受误导。 - Examples are given to explain the choices of different investment portfolios in regard to the large and small investors in the Security Market at present.
最后运用具体的股票投资组合实例，分析了大中型机构投资者和中小投资者在投资组合方面的不同取向。
