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Moment：瞬间；重要时刻

Instant：瞬间；立刻

Minute：片刻；一瞬间

例：

You all can imagine that suspenseful moment.

你们都可以想象那令人紧张的瞬间。

She looked at him and felt the instant spark of connection she had only experienced once before.

她看着他，瞬间闪过一丝心灵相通的火花，这样的碰撞以前只有过一次。

He worked out the problem at the last minute.

他在最后一瞬把那道题做了出来。

minute指极短的时间，但可觉察到时间的持续；moment较minute所表示的时间短，只一霎那或一段很短的时间；有时也含持续的意味；instant常与moment换用，指一瞬间，但更侧重时间短促，多用于表示紧迫、瞬变等情况。

In two twos：立刻；一转眼

In two ticks：一转眼间；一刹那间

例：

Spring came in two twos, and winter left.

一转眼，冬去春来。

Noticed that he is looking at her, she felt rapid heartbeat in two ticks.

感觉到他在看自己，那一刹那她感觉心跳加快。

In a second：立刻；很快

In two microseconds：两微秒内，形容时间极短，一瞬间

例：

It’s too fast. All happened in a second.

太快了，一切只在瞬间发生。

A disaster happens in two microseconds, but it will take thousands of years to forget the sadness for people.

灾难的发生仅在一瞬间，但是对于人们来说忘记伤痛需要千年。

In a trice：转眼之间；即刻

In a wink：瞬息之间；一眨眼功夫

例：

We all thought he would leave for a long time, but in fact, he came back in a trice.

我们都以为他会离开很长一段时间，但事实上，他一转眼就回来了。

All things in nature change in a wink.

自然中一切瞬息万变。

For an instant：片刻；瞬间

A split second：一霎那；一瞬间

例：

Met his eyes for an instant, she paid all her attention to the other place immediately.

与他的目光相触的瞬间，她立刻把注意力集中在其他地方。

For a split, I thought that is hallucination.

有一瞬间，我以为那是幻觉。