Express one's perfection
一个人───single;完美───perfect
Is it difficult being a single mother?───做单身妈妈难吗？
When will the single currency be operable?───什么时候实行单一货币？
They were leery about investing in a company controlled by a single individual.───把资金投向一个由一人独自操控的公司，他们不大放心。
You can't just count upon one single person to get the work done properly.───单指一个人是不能把事情做好的.
The revenue from tourism is the biggest single item in the country's invisible earnings.───旅游业收入是该国无形收益当中最大的一项。
A single candidate is put forward and the people vote yes or no.───先推出一个候选人，由人们投票表示赞成或反对。
He was killed by a single shot from an unseen soldier.───一个埋伏的士兵一枪就把他打死了。
It's possible to score six runs off a single ball, if you hit it far and high enough.───如果把球击得又远又高,一次就有可能得六分.
He sent her a single red rose.
A single spark can start a prairie fire.
Misfortunes never [seldom] come alone [single].
I couldn't understand a single word she said!
He knocked his opponent down with a single blow.