beneficial

a drug that has a beneficial effect on the immune system.有益于免疫系统的一种药物

an arrangement that is mutually beneficial.一项互惠互利的协定

bene(善， 好) ＋ fic(做) ＋ ial(…的) → 做好事 → 有利的， 有益的记忆

mutually beneficial互利的；双赢的

beneficial owner受益所有人

beneficial use享用，有权使用

真题例句...which is beneficial for them to improve their relationship...CET42017.12写作题

真题例句...which is not beneficial to further interpersonal relationship and promote the feeling of harmony...第一套CET42013.12写作题