Stop order（证券停止交易通知书/止损订单），是指当市场价格达到客户预先设定的触发价格时，即变为市价指令予以执行的一种指令。

A stop order is an order to buy or sell a security when its price moves past a particular point, ensuring a higher probability of achieving a predetermined entry or exit price, limiting the investor's loss or locking in a profit. Once the price crosses the predefined entry/exit point, the stop order becomes a market order.

证券停止交易通知书是在价格超过特定点时买卖证券的订单，以确保达到预定的进场或退出价格的可能性更高，从而限制了投资者的损失或锁定利润。一旦价格超过预定的进入/退出点，证券停止交易通知书将变成市场订单。

例句：

Stop orders are orders that are triggered when a stock moves past a specific price point. Beyond that price point, stop orders are converted into market orders that are executed at the best available price.

证券停止交易通知书是当股票超过特定价格点时触发的订单。超过该价格点，证券停止交易通知书将转换为以最佳可用价格执行的市场订单。

Traders often enter stop orders to limit losses or to capture profits on price swings.

贸易员通常会输入止损单，以限制损失或在其价格波动时获取利润。