プログレッシブ和英中辞典(第4版)の解説
やくわり【役割】
a part; a role
光は植物の生育に重要な役割を果たす
Light plays an important part in the growth of plants.
演技者の中には自分の役割が気に入らない者もいた
Some of the performers were dissatisfied with their roles [parts].
彼は自分の役割を果たしていない
He's not pulling his own weight.