如果你 “take a leaf out of someone’s book（从某人的书中取出一页）”，意思就是你 “效仿某人的成功案例，以某人为榜样”。

例句
Take a leaf out of Rob’s book and start cycling to work.
以罗布为榜样，开始骑自行车上班吧。

He took a leaf out of his friend’s book and started revising two months before his exams.
他效仿一位朋友的学习方法，在考试前两个月就开始复习。

I’m taking a leaf out of Xiao Rui’s book and bringing my own lunch to work to save money.
我效仿肖瑞，上班自带午餐来省钱。