立即英语短语
at once 立即；同时;一起;
例句
If necessary I can come at once.
如果有必要，我可以马上来。
Come here at once! she ordered.
“马上过来！”她命令道。
She fell in with my idea at once.
她立刻同意了我的主意。
I have to go, I really must, at once
我得走了，我真的必须马上就走。
You can\'t be doing two things at once
不能一心二用。
I dreamed up a plan to solve both problems at once
