中文：

恒生指数是香港股市最重要的股票指数之一，也是全球最重要的股票指数之一。它是由恒生银行于1969年11月24日发布的，是香港股票市场最具代表性的股票指数之一。

恒生指数是由香港股市中选取33家具有代表性的蓝筹股组成的，这些股票的总市值占香港股市总市值的60%以上。这些蓝筹股具有较高的流通市值和交易量，因此能够反映香港股市的整体走势。

恒生指数的编制方法是由恒生银行按照市场价格计算每个股票的加权平均价格，并按照市值大小进行加权平均。每个股票的权重是根据其流通市值的大小来确定的，因此市值较大的股票在恒生指数中的权重较大。

恒生指数是香港经济发展的重要指标之一，也是投资者进行投资的重要参考指标之一。它不仅代表了香港股市的整体走势，也反映了香港经济的整体情况。因此，投资者可以通过观察恒生指数的变化来了解香港经济的整体情况。

英文：

The Hang Seng Index is one of the most important stock indexes in the Hong Kong stock market, as well as one of the most important stock indexes in the world. It was launched by Hang Seng Bank on November 24, 1969, and is one of the most representative stock indexes in the Hong Kong stock market.

The Hang Seng Index is composed of 33 representative blue-chip stocks selected from the Hong Kong stock market, with a total market value accounting for more than 60% of the total market value of the Hong Kong stock market. These blue chips have high liquidity and trading volume, so they can reflect the overall trend of the Hong Kong stock market.

The calculation method of the Hang Seng Index is that Hang Seng Bank calculates the weighted average price of each stock according to the market price, and calculates the weighted average according to the market capitalization. The weight of each stock is determined according to its liquidity market capitalization, so stocks with larger market capitalizations have a greater weight in the Hang Seng Index.

The Hang Seng Index is not only an important indicator of Hong Kong's economic development but also an important reference indicator for investors to invest. It represents not only the overall trend of the Hong Kong stock market but also reflects the overall situation of Hong Kong's economy. Therefore, investors can understand the overall situation of Hong Kong's economy by observing changes in the Hang Seng Index.