付き物

プログレッシブ和英中辞典(第4版)

つきもの【付き物】

権利に義務は付き物だ
Rights 「come together with [are accompanied by] duties.

金もうけに危険は付き物だ
We cannot make money without taking risks.

昔は正装と言えば帽子と手袋が付き物だった
In the old days, 「hats and gloves were musts for formal occasions [you wouldn't be considered formally dressed without a hat and gloves].

出典　小学館「プログレッシブ和英中辞典(第4版)」