重要

avail

/əˈveɪl/📚 18979 93 1六级考研雅思
If you do something to no avail or to little avail, what you do fails to achieve what you want. 徒劳

noun [抽象名词]效用,利益

His efforts were to no avail.
他的努力是徒劳的。

verb [vt. 及物动词]利用,有益于;有益于

Guests should feel at liberty to avail themselves of your facilities.
客人们应可以随意使用你们的设施。

a(对, 向) + vail(价值) → 对…有价值 → 有帮助, 有益
单词造句:
网友用“Avail”造句精选
The doctors tried everything to keep him alive but to no avail. 医生千方百计想使他活下来,但无济于事。
Your ability to argue is of little avail if the facts are wrong. 如果论据是错的,你的辩才也就没有什么用了。