如果某人在日常生活中总是以同样的方式做同样的事情，就可以把此人比作 “creature of habit（习惯性动物）”，意思是 “一成不变、生活极有规律的人”。

例句

Roy is a creature of habit – he has to clean his teeth as soon as he gets out of bed.
罗伊生活非常有规律，他一起床就去刷牙。

I’m a creature of habit – I always have to eat a biscuit with my cup of coffee.
我是个习惯性动物，喝咖啡时总要吃块饼干。

She always has to buy a bucket of popcorn every time we go to the cinema – she’s such a creature of habit.
每次我们去看电影，她总是要买一桶爆米花，她真是一成不变。