"Once the principal contradiction is grasped, all problems will be readily solved."

"一旦抓住了主要矛盾,一切问题就迎刃而解。"

Their attempts at conciliation had failed and both sides were once again in dispute.

他们进行调停的努力失败了,双方再次陷入争吵。

Many words once commonly used have fallen into desuetude.

许曾通用的词, 今天已经废弃不用了。

Once a famous actress, she is now in eclipse.

她是名演员，今日已黯然失色。

The house has an absentee landlord, who visits the property once a year.

这栋房子的房主不在这儿住，一年来一次。

Once lovely countryside is absorbed by urban sprawl.

这个曾经风光秀丽的乡村在城市的无规划展中消失了。

I advise you to own up at once.

我劝你立即坦白。

Put this cloth alongside real silk, and you will at once see the difference.

把这块料子同真丝放在一起比较, 你就会立刻看出差别。

He altered his face all at once.

他突然变了脸。

I'd once seen him blithely overbid for a tiny James I miniature portrait.

我曾看到他为一幅小小的詹姆士一世微缩肖像漫不经出更高的价。

In this country pornography was once sold under the counter.

在该国, 色情书画曾一度在黑市出售。

He once did her a good turn, but she repaid it with a bad turn.

他曾经帮助她, 而她却以怨报德。

Her good nature can be presumed upon once too often.

不妨再利用一次她那善良的天性。

Some employers reneged on agreements once the recession set in.

经济一衰退，有些雇主就违背了协议。

The tiger that has once tasted blood is never sated with the taste of it.

一次尝到血,虎欲永难填。

Our region is poised for growth once the election is out of the way.

大选一结束,我们区就为发展作好了准备。

Mistakes in the printing should be pointed out at once.

印刷上的错误应立即予以指出。

I was reminded of it once more.

有人又一次提醒我这件事。

The earth orbits the sun once every 365.25 days.

球每365.25天绕太阳轨道一圈。

The once clear mountain stream is now polluted and opaque.

曾经是很清澈的山溪, 现在受到污染变得混浊了。