at pains

Prepositional phrase

idiomatic with-infinitive

(idiomatic, with infinitive) Making careful effort (to).

Japanese Meaning

一生懸命に努力して〜する / 念入りに苦労して〜する

She was at pains to explain the procedure clearly to the patients.

彼女は患者に手順をわかりやすく説明しようと苦心した。

Sense（1）

(idiomatic, with infinitive) Making careful effort (to).

The agency has been at pains to stress that its decisions are still based on sound science.