1. in an instant : 马上；

2. on the instant : 马上；

1. instant的解释

1. The telegram asked for an instant reply.
    这封电报要求立即回复。

2. The flood victims were in instant need of help.
    水灾难民急需救助。

1. I shall be back in an instant.
    我马上就回来。

2. An instant later the explosion occurred.
    一会儿之后，爆炸就发生了。

3. instant是什么意思

3. I sent you the news the instant (that) I heard it.
    我一听到此消息，便通知你了。

1. 立即：(3)现在(present)与立即(instant)的复制(copy):杨牧的诗:(我已不是那爱写长信的少年了...),道尽时下已经没有人有耐心的做一件需要等候,需要毅力的大工程.

1. 瞬息;顷刻;刹那
    An instant is an extremely short period of time.

    e.g. For an instant, Catherine was tempted to flee...
           有那么一会儿,凯瑟琳很想逃跑。
    e.g. The pain disappeared in an instant.
           疼痛立刻就消失了。

2. (某一)时刻
    If you say that something happens at a particular instant, you mean that it happens at exactly the time you have been referring to, and you are usually suggesting that it happens quickly or immediately.

    e.g. At that instant the museum was plunged into total darkness...
           就在那时,博物馆陷入了一片漆黑。
    e.g. In the same instant he flung open the car door.
           与此同时,他猛地推开了车门。

3. 一…(就)
    To do something the instant something else happens means to do it immediately.

    e.g. I had bolted the door the instant I had seen the bat.
           我一看到蝙蝠就把门闩上了。

4. 立即的;即刻的
    You use instant to describe something that happens immediately.

    e.g. Mr Porter''s book was an instant hit...
           波特先生的书一经推出便大受欢迎。
    e.g. He had taken an instant dislike to Mortlake.
           他一到莫特莱克就觉得不喜欢这个地方。

5. (食品)已配制好的，调制快速方便的，速溶的
    Instant food is food that you can prepare very quickly, for example by just adding water.

instant的近义词

    e.g. ...instant coffee.
           速溶咖啡