我今年二十岁。

I am twenty years old this year.

她看起来像个萝莉，但实际上已经二十岁了。

She looks like a Lolita, but she is actually twenty years old.

你才二十岁。你为什么那么偾世嫉俗？

You are only twenty years old. Why are you so cynical?

“卫星怎么了？”她问。她是个美丽的女孩，大约二十岁，黑黑的长发，大大的眼睛。

‘What's wrong with the satellite?’she asked.She was a beautiful girl,about twenty years old,with long black hair and big eyes.

我十八岁，吉米二十岁。

I was eighteen and Jimmy was twenty.

“等你二十岁？”皮蒂问。

“When you're twenty?” Petey asked.

他很幸运，在二十岁时就做着自己喜欢的事情。

He is lucky that at the age of only twenty he is doing something he loves.

二十岁时，他参加了著名科学家汉弗莱·戴维的四场关于化学的讲座。

At the age of twenty, he went to four talks about chemicals by the famous scientist Humphrey Davy.

他在二十岁时掌握了几种语言。

He mastered several languages by the age of twenty.

她举办了一个大派对庆祝她的二十岁生日。

She celebrated her twenty birthday with a big party.