中文：

股票是一种有价证券，是股份有限公司公开发行的一种股权证书，它代表了股东对公司的所有权。股票交易是投资者通过买卖股票进行投资的一种方式。那么，股票什么时候交易呢？

一般来说，股票的交易时间是根据交易所的规定来确定的。在中国，上海证券交易所和深圳证券交易所的交易时间是每个工作日的上午9:30至11:30，下午1:00至3:00。在这两个时间段内，投资者可以进行股票买卖交易。

此外，一些投资者也会选择在晚上进行股票交易。这是因为晚上是欧美等海外股市的主要交易时间，这些市场的交易会对全球股市产生影响。因此，一些短线投资者和套利投资者会选择在晚上进行交易。

总的来说，股票的交易时间是根据交易所的规定来确定的，一般是在工作日的上午和下午。但是，对于一些投资者来说，晚上也是进行股票交易的重要时间段。

英文：

Stock is a kind of negotiable security representing the ownership of shareholders of a joint stock company. Stock trading is a way for investors to invest through buying and selling stocks. So, when do stocks trade?

Generally speaking, the trading time of stocks is determined by the exchange's regulations. In China, the trading hours of the Shanghai Stock Exchange and Shenzhen Stock Exchange are from 9:30 to 11:30 am and 1:00 to 3:00 pm on weekdays. During these two time periods, investors can engage in stock buying and selling transactions.

In addition, some investors also choose to trade stocks at night. This is because the evening is the main trading time for overseas stock markets such as Europe and the United States, and these markets will have an impact on global stock markets. Therefore, some short-term investors and arbitrage investors will choose to trade stocks at night.

Overall, the trading time of stocks is determined by the exchange's regulations, generally during the weekday morning and afternoon. However, for some investors, nighttime is also an important trading period for stocks.