take to sth like a duck to water 

to discover when you start to do something for the first time that you have a natural ability to do it

自然而然地做起…來，天生就會做…

He took to fatherhood like a duck to water.

他天生就是個好父親。

She has taken to teaching like a duck to water.

她教起書來駕輕就熟。

（素材來自每日學英語，如有侵權請聯(lián)系刪除）