马上的英文：
at once
right away
immediately

参考例句：

It’s spoiling for a hurricane, if you ask me.
要是你问我的意见，我认为飓风马上就来。

a saddle rifle
在马上用的步枪

The answer came pat.
答案马上出来了。

Straddle a fence,ditch,horse
跨在栅栏、沟、马上.

A matador;a bullfighter.
斗牛士;(马上)斗牛士

In a moment; in a minute
一会儿的时间;马上

Yeah. The baseball game will be on the air in a few seconds.
有啊。马上就要转播棒球比赛了。

Bring this patient to the emergency room for first aid at once.
马上把这位病人送急诊室进行急救。

You're a feisty little one, but you'll soon learn some respect.
你很顽皮，不过你马上就会学会遵从。

The finals are going to begin soon and the players are intensifying their training.
决赛马上就要开始了,队员们正在加紧练习。

once是什么意思：
adv. 一次，一回；一度；曾经
conj. 一旦；一…就…
n. 一次；一回

Once is no custom
一次不成例

Do it for this once.
就干这一次吧。

Gordon is at once modest and clever.(at once …and…既..又)
戈登既聪明又谦逊

away是什么意思：
adv. 在远处；离开，远离；消失

to kick away; to spurn away
一脚踢开

to die away; to fade away; to vanish; to elapse; to wear away
消逝

She barked the boy away.
她把那男孩喝走了。

immediately是什么意思：
adv. 立即；直接地
conj. 一…就

immediate bridge
立即齿桥

The law is effective immediately.
这项法律立即生效。

The evidence has no immediate bearing on the case.
该证据与本案无直接关系。