avail
n.[一般用于否定句或疑问句中]效用,帮助We searched the whole area but all to no avail. Robbie had disappeared.我们搜遍了整个地方但毫无结果,罗比失踪了。
available
a.现成可使用的,可利用的;可得到的Tickets are available from the box office.售票处有票出售。
critic
n.批评家,评论家a review by the theatre critic of the Sunday Times《星期日泰晤士报》的戏剧评论员写的一篇评论
critical
a.决定性的,关键性的,危急的;批评(判)的Many parents are strongly critical of the school.许多家长对这所学校提出了强烈的批评。