something that indicates what may happen or what is happening 路标◆Investors know that past performance is no guide to future returns. 投资者知道过去的业绩并非指向未来的回报。
something that helps you to form an opinion or make a decision 有指导意义的事物；指导的事物◆These figures are just a rough guide. 这些只是大致的数字。➡guideline
a book or document which tells you about sth 指南◆a restaurant/hotel/city guide 餐厅／旅馆／城市指南◆You can download the site's 10-step guide to investing. 可以从这个网站下载投资 10 步指南。