词根词缀a 加强 + vail 价值，值 → 有价值可利用 → 利用；效用 → avail v.利用；有益于，有助于 n.效用，利益；帮助
词根记忆a(to)+vail(=val=wor… * → avail v.利用；有益于，有助于 n.效用，利益；帮助
串记记忆Jail life made the … * → avail v.利用；有益于，有助于 n.效用，利益；帮助
对比记忆avail n.效用，利益; 帮助
谐音记忆呃 … * → avail v.利用；有益于，有助于 n.效用，利益；帮助
谐音记忆二维… * → avail v.利用；有益于，有助于 n.效用，利益；帮助
谐音记忆饿胃… * → avail v.利用；有益于，有助于 n.效用，利益；帮助
联想记忆a（加强）+vail（外力） → 去… * → avail v.利用；有益于，有助于 n.效用，利益；帮助
词根记忆a表加强 + vai = way道路… * → avail v.利用；有益于，有助于 n.效用，利益；帮助
单词例句
His efforts were to no avail.
他的努力是徒劳的。
All to no avail.
但这一切都无济于事。
Eloquence will avail you little or nothing.
善辩的口才对你没有益处。
His efforts did not avail to save the business.
他的努力未能挽救这家企业。
She availed herself of the opportunity to study abroad.
她抓住了出国留学的机会。
All his attempts were of no avail.
他所有的尝试都徒劳无功。
Will this medicine avail to relieve his pain?
这药能缓解他的疼痛吗？
He shouted for help, but to little avail.
他大声呼救，但没什么用。
Crying won't avail you now.
现在哭对你没用。
You should avail yourself of the library's resources.
你应该利用图书馆的资源。
They tried to negotiate, but without avail.
他们试图谈判，但毫无结果。
Money alone will not avail if you lack discipline.
如果你缺乏自律，光有钱也没用。
Her advice was of some avail to him.
她的建议对他有些帮助。
The hotel is fully booked, there's no availability for tonight.
酒店已满员，今晚没有空房。
She was unavailable for comment due to her busy schedule.
由于她的日程繁忙，她无法接受采访。
The server is currently unavailable; please try again later.
服务器暂时无法访问，请稍后再试。
The book you requested is not available in our library at the moment.
你所要求的书目前我们图书馆没有库存。
I'm unavailable to attend the meeting, I have an urgent appointment.
我不能参加会议，我有个紧急约会。
Avail yourself of the resources provided by the company.
利用公司提供的资源。
They have made the software available for free download on their website.
他们已将软件免费提供在他们的网站上下载。
The flight from New York to London is now available with a direct connection.
从纽约到伦敦的航班现在有直飞选项。
Please make sure to check availability before making a reservation.
预订之前请确认是否有空位。
He is an expert in his field, his knowledge is always available to those who seek it.
他是该领域的专家，他的知识随时供需要的人使用。