It must be beginner's luck.

这一定是初学者的好运。

youdao

Trev: That's just beginner's luck.

崔佛：那只是初学者的运气。

youdao

His success is purely beginner's luck.

他的成功纯属新手的好运气。

youdao

Only Europe, which operates the Mars Express orbiter, has had beginner's luck on Mars.

MSN: History littered with failed Mars probes

The 72-year-old said he had "beginner's luck" in 2011 with his first ENO production, The Damnation of Faust.

BBC: Terry Gilliam to return to the English National Opera

Some of that success, however, could be beginner's luck, which is a prominent feature of the entire industry.

ECONOMIST: Hedge funds