彼は一時期フランスに住んで、それからイタリヤに行った。

tbd

He dwelt for a time in France, then went to Italy.

He lived in France for some time, then went to Italy.

一時期は、コーラにはまって、毎日のように飲んでたよ。

tbd

For a while, I was really into cola, drinking it every day.

For a while, I was really addicted to cola and drank it every day.

私は一時期、天体物理学者になりたかった。

tbd

I once wanted to be an astrophysicist.

我曾經想過當個太空物理學家。