A single person is OK.

一个人也不错。

A Single person needs about 2-3.

一个人需要大约2~3个。

There was not a single person in the house.

屋子里一个人都没有.

There wasn't a single person on the beach.

海滩上一个人影儿都没有。

Every single person deserves respect and dignity.

每一个人都值得获得尊重和尊严。

Not a single person has been in the shop this morni ng.

今天上午这个商店里连一个人都没有.

Not a single person has been in the office this afternoon.

今天下午竟然没有一个人来过办公室.

The defense forces never killed a single person in a single town. We have disciplined heroic soldiers.

国防军从来没有在一个城镇杀过一个人。我们训练了英雄战士。

People together can make a single person can make career; gradually

人们在一起可以做出单独一个人所渐能做出的事业；

A single person was able to steal the personal information of millions of people.

一个人就可以盗窃数百万人的个人信息。