中文段落：

股票未成交委托，是指在股票交易市场中，投资者向证券公司或证券交易所提交的买卖股票的委托指令，由于某些原因，这些指令在交易日内未能得到成交的状态。这种状态的出现可能有多种原因，比如投资者设置的委托价格与市场价格不符，或者市场行情剧烈波动导致委托无法及时成交。

对于投资者来说，理解股票未成交委托的含义和处理方式至关重要。一旦发现自己的委托未能成交，投资者应该首先检查自己的委托价格和数量是否设置得当，同时也要关注市场的实时走势，以便做出及时的调整。如果委托未能成交是因为市场波动过大，投资者可能需要重新评估自己的投资策略，以应对市场的变化。

此外，投资者还需要注意，未成交的委托指令在交易日内不会自动撤销，需要投资者手动进行撤销操作。如果投资者未能及时撤销未成交的委托，可能会产生不必要的风险和损失。

英文段落：

An unexecuted order in the stock market refers to the state where investors submit buy or sell orders to securities companies or stock exchanges, but these orders fail to be executed within the trading day due to various reasons. Such reasons may include the mismatch between the investor's desired price and the market price, or rapid market fluctuations that prevent timely execution of the order.

For investors, it is crucial to understand the meaning and handling of unexecuted orders. Upon discovering that their orders have not been executed, investors should first check if their order prices and quantities are appropriately set. At the same time, they should monitor the real-time market trends to make timely adjustments. If the unexecuted order is due to excessive market volatility, investors may need to re-evaluate their investment strategy to adapt to the changing market conditions.

It's also important to note that unexecuted orders do not automatically cancel within the trading day and require manual cancellation by investors. Failing to promptly cancel unexecuted orders may result in unnecessary risks and losses.