in an instant，例如：
1.I'll be back in an instant.我马上就回来。
2.The pain disappeared in an instant.疼痛立刻就消失了。
3.No matter what he is offered to eat he polishes it off in an instant不管给他吃什么，他都能眨眼就下肚。
4.No matter what he is offered to eat he polishes it off in an instant不管给他吃什么，他都能眨眼就下肚。
1/instant释义：
adj. 立即的；紧急的；紧迫的
n. 瞬间；立即；片刻
2/例句：
We must take instant measures to save the children who have fallen into the water.
我们要马上采取紧急措施营救落水的儿童。
3/instant短语有：
in an instant瞬间；马上
instant messaging即时通讯
for an instant片刻，瞬间
instant noodle方便面；速食面；泡面
instant food方便食品
