Are there enough people on hand to hold a meeting?
有足够多的人能开会吗？
(on hand means available)
（on hand指有空的）
Employee absenteeism has gotten out of hand.
员工旷工已到了无法控制的地步。
(out of hand means out of control)
（out of hand指无法控制）
Could you lend me a hand with this piano?
你能帮我搬一下这架钢琴吗?
(lend someone a hand means help)
（lend someone a hand指帮助）
Tom was hands-down the best student at the University.
汤姆无疑是大学里最好的学生。
(hands-down means obviously)
（hands-down 指明显地）
The exams at two. Will you keep your fingers crossed for me?
考试2点开始。你会为我祈祷吗?
(keep your fingers crossed means wish for good luck)
（keep your fingers crossed指祈祷好运）