标准普尔400代表的是美国股市的中盘股，而标准普尔500代表的是大盘股。
The S P400 represents the Mid-Cap stocks in America , whereas the S P500 represents the Big-Cap stocks .
这两个收购目标都是增长迅速的中盘股，最高层都是身为控股股东的强势人物。
Both targets are fast-growing mid-caps , run by strong characters who are also the dominant shareholder .
中盘股