GPT答：

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Stocks in the United States differ from stocks in China in many ways. The two countries' stock markets are significantly different in terms of size, liquidity, trading opportunities, and rules and regulations. 

In terms of size, the United States stock market is the largest in the world with a market capitalization of about $35 trillion. The Chinese stock market, on the other hand, is much smaller with a market capitalization of about $5 trillion. 

In terms of liquidity, stocks in the United States are typically more liquid than those in China. This is because of the comparatively larger number of buyers and sellers, as well as the more efficient and transparent market structure in the US. 

The trading opportunities available in the United States stock market are also much greater than those in China. In the US, investors have access to more stocks, a wider range of financial instruments, and more efficient capital markets. In China, however, the availability of these products is more limited and trading opportunities are fewer. 

Lastly, the rules and regulations governing the stock market in the United States and China are also very different. The US has a much more stringent set of regulations, which are designed to protect investors and ensure the accuracy and integrity of the market. In China, regulations are less strict and some scams are common.