什么是净大单净中单？

中文段落：

净大单净中单是股票交易中的一个常用术语，用于描述大单和中单交易的净差值。在股票市场中，交易者根据交易量的大小，将交易单分为大单、中单和小单。大单通常指的是交易量较大的订单，而中单则介于大单和小单之间。净大单净中单的计算公式为：净大单 = 大单买入量 - 大单卖出量；净中单 = 中单买入量 - 中单卖出量。

净大单净中单的分析对投资者具有重要意义。通过观察净大单净中单的变化，投资者可以判断主力资金的流向，进而判断市场的多空力量对比。当净大单净中单持续为正时，意味着大单和中单买入力量较强，市场呈现买入态势；当净大单净中单持续为负时，则意味着大单和中单卖出力量较强，市场呈现卖出态势。

此外，净大单净中单还可以用于识别个股的强弱。当一只股票的净大单净中单持续为正，并且数值较大时，通常表明该股票受到大资金的追捧，具有较强的上涨动力；反之，当净大单净中单持续为负，并且数值较大时，则可能意味着该股票受到大资金的抛压，存在下跌风险。

需要注意的是，净大单净中单只是市场的一个参考指标，投资者在使用时还需要结合其他技术指标和市场信息进行综合分析，以做出更为准确的判断。

**英文段落：

Net large order and net medium order are commonly used terms in stock trading, referring to the net difference in large and medium-sized transactions. In the stock market, traders classify trade orders into large orders, medium orders, and small orders based on the size of the transaction volume. Large orders typically refer to orders with a significant transaction volume, while medium orders fall between large and small orders. The calculation formula for net large orders and net medium orders is: Net large orders = Large buy volume - Large sell volume; Net medium orders = Medium buy volume - Medium sell volume.

The analysis of net large orders and net medium orders is crucial for investors. By observing the changes in net large orders and net medium orders, investors can judge the flow of major funds and further assess the contrast of bullish and bearish forces in the market. When net large orders and net medium orders remain positive, it indicates strong buying power from large and medium orders, and the market presents a buying sentiment. Conversely, when net large orders and net medium orders remain negative, it suggests strong selling pressure from large and medium orders, and the market exhibits a selling sentiment.

Additionally, net large orders and net medium orders can be used to identify the strength of individual stocks. When the net large orders and net medium orders of a stock remain positive with relatively large values, it usually indicates that the stock is being chased by significant funds and has strong upward momentum. Conversely, when the net large orders and net medium orders are consistently negative with large values, it may suggest that the stock is under selling pressure from significant funds and faces the risk of a decline.

It's worth noting that net large orders and net medium orders are only reference indicators in the market. Investors need to combine other technical indicators and market information for comprehensive analysis when using them to make more accurate judgments.