at a moment是什么意思
at a moment 一会儿；
moment
n.片刻;瞬间;准确时刻;正是时候;时机;机遇;时光;做某事的时刻；
复数 moments；
例句
You must be ready to leave at a moments notice.
你必须随时准备出发。
Have I caught you at a bad moment?
我是不是来得不是时候？
She stared at him a moment, then turned away
她凝视他片刻，然后转过脸去。
I believe that I have arrived at a very opportune moment
我想我到得正是时候。