公司投资需要钱时,可以通过在证券市场发行有价证券来筹集资金。一般可供选择的有价证券有两种:一种是股票(即普通股),一种是债券。人们可以在证券交易所里买卖这些有价证券。 When companies need money, they can raise money by issuing securities in the stock market. There are two kinds of securities that you can choose from: one is stock (ie common stock) and the other one is bond. People can buy and sell these securities on the stock exchange.