【中文版】

委比是一种金融市场指标，用来衡量投资者的意愿和需求。它表示在特定时间内，买卖双方在某个交易品种上的报价和实际成交价格之间的差异。

具体来说，委比是用百分比来表示的，它等于100乘以（买入报价-实际成交价格）/（买入报价+实际成交价格）。当委比为正数时，表示买入报价高于实际成交价格，市场处于上涨趋势；而当委比为负数时，表示买入报价低于实际成交价格，市场处于下跌趋势。

委比指标在金融市场上被广泛使用，可以帮助投资者了解市场的供需情况，从而做出更明智的投资决策。例如，如果委比为正数且较高，说明市场上涨意愿强烈，投资者可以考虑买入；反之，如果委比为负数且较低，说明市场下跌意愿强烈，投资者可以考虑卖出。

需要注意的是，委比指标并不能直接决定市场的走势，而只是在一定程度上反映市场的意愿和需求。因此，投资者在使用委比指标时，还需要结合其他市场信息和自身投资策略进行分析和判断。

【英文版】

委比 is a financial market indicator used to measure investors' willingness and demand. It represents the difference between the bid and ask prices of a particular trading instrument within a specific time frame.

Specifically, the委比 is expressed as a percentage and is calculated by multiplying 100 times the difference between the bid price and the actual transaction price divided by the sum of the bid price and the actual transaction price. When the委比 is positive, it means that the bid price is higher than the actual transaction price, indicating that the market is in an upward trend; while when the委比 is negative, it means that the bid price is lower than the actual transaction price, indicating that the market is in a downward trend.

The委比 indicator is widely used in financial markets to help investors understand the supply and demand situation in the market, so as to make more informed investment decisions. For example, if the委比 is positive and high, it means that the market's upward sentiment is strong, and investors may consider buying; on the other hand, if the委比 is negative and low, it means that the market's downward sentiment is strong, and investors may consider selling.

It should be noted that the委比 indicator cannot directly determine the market's trend, but only reflects the market's willingness and demand to a certain extent. Therefore, when using the委比 indicator, investors still need to combine other market information and their own investment strategies for analysis and judgment.