回答

・a guide(to)

例句
I would like to say to my teacher at school, "I would love to read books which will serve as a guide of my life."
我想對學校的老師說，「我想讀一本能指導我人生的路標的書」

「路標」在其他情況下，還有
"a handbook "、"a manual"
等表達方式。

順便一提，給行人的「指路牌」 還有
"a guidepost"、”a guide board"、”a fingerpost"、"a direction post"、”way mark"
等表達方式。

有幫助｜0