股票的命线指的是股票价格的长期趋势线。

中文解释：

股票的命线是指股票价格的长期趋势线，它反映了股票价格在较长时间内的变化趋势。股票价格的波动受到多种因素的影响，包括市场供求关系、公司业绩、宏观经济形势等。而长期趋势线则是将这些因素综合起来，形成一条反映股票价格总体走势的曲线。对于投资者来说，掌握股票的命线非常重要，因为这有助于他们判断股票价格的未来走势，从而做出更加明智的投资决策。

英文解释：

The lifeline of stocks refers to the long-term trendline of stock prices. It reflects the change trend of stock prices over a long period of time. The fluctuation of stock prices is affected by multiple factors, including market supply and demand, company performance, macroeconomic situation, etc. The long-term trendline comprehensively integrates these factors to form a curve that reflects the overall trend of stock prices. For investors, mastering the lifeline of stocks is very important, because it helps them judge the future trend of stock prices and make more informed investment decisions.