一瞬间的英文：
a split second
flash
half a tick
in a split second
in a twinkle
in a wink
in the twinkling of an eye
in two ticks
in two twos
tick

参考例句：

A transient smile
一瞬间的微笑

It startled the breath out of me, for an instance
一瞬间，这情景使我大吃一惊。

The incident was over in a twinkle.
那件事一瞬间就过去了。

The accident was over in the blink of an eye.
事故在一瞬间就过去了。

His perception of the change came in a flash.
他在一瞬间察觉到了这一变化。

Her lucid eyes catch yours for a fleeting moment that seems to have lasted forever.
她清澈的眼睛吸引你视线的一瞬间似乎是永恒的。

There will be at least one breathless moment when the bill for the dinner is presented
至少在账单拿来的时候，会有令人透不过气的一瞬间。

In that hushed moment I recognized the makings of a prize-winning news photograph.
在那寂静的一瞬间，我意识到这将是一张能让我获奖的新闻照片。

The ferret-faced caporegime understood everything in a flash of a second. And accepted it.
这位鼠头鼠脑的司令一瞬间恍然大悟，但也只有听天由命了。

"And yet, looking down at him in a moment that was like a secret, passing sign, her face did tell him."
然而,在她低头看他时的一瞬间---这一瞬间象是个一闪即逝的暗号---她的脸色告诉了他。

split是什么意思：
v. （使）裂开，分离；分担，分享；分割；（使）分裂；离开；揭发；增加发行
n. 裂缝；意见分歧；不同；一份；劈腿
adj. 裂开的；分裂的

They didn't crystallize, they split.
他们不是具体化，而是分裂。

The issue will split the Demoratic Party.
该问题会分裂民主党的。

Your coat has split at the seams.
你的上装接缝处裂开了。

second是什么意思：
adj. 第二的；第二次的；次要的
adv. 以第二位
n. 秒；第二名
v. 支持，赞同

the second in command
副司令员

grounded to the second baseman.
打到二垒手位置的滚地球

Down Second Avenue
沿着第二条林荫大道走去

flash是什么意思：
v. （使）闪光，反射；亮出；飞驰，掠过；（使）闪现；发出；传送
n. 闪光；一瞬间，闪现；闪光灯；手电筒
adj. 浮华的；火速的；庞大的；闪光的

Have you seen the flashing?
你看见闪光了吗？

There is no flash shadow .
并没有闪光的影子。

We need a flash banner.
我们需要一副闪光的条幅。