I was unaware that banks would be closed today.

我不知道今天银行不营业。

Nancy was unaware of her son's lies and gave him the money he asked for.

南希未意识到儿子的谎话就把他要求的钱给了他。

The elevator will not be in use today as we need to undertake routine maintenance.

电梯今日无法使用因为我们要进行例行维修。

The two countries undertook to find a peaceful solution to their conflict.

这两国承诺要寻求和平解决冲突的方法。

Your visit was unexpected, but you're welcome to stay for tea.

没想到你会来访，但欢迎你留下来喝杯茶。

After the first fifty pages, the story takes an unexpected turn.

这个故事在过了前面五十页之后有了令人意想不到的转折。

His decision to run for president was not entirely unexpected.

他竞选总统的决定并非完全出乎意料。

Union leaders have decided to strike because of unsafe working conditions.

工会领袖因工作环境不安全而决定罢工。

The union of the two businesses allowed them to make more money.

这两家企业合併让他们赚更了多钱。

Several new countries came into being when the Soviet Union broke up in 1991.

苏联在一九九一年解体时，几个新的国家就形成了。

The groups united to fight their common enemy.

那些团体联合起来对抗共同的敌人。

The coach did his best to unite the team before the big game.

在重要比赛前，教练尽全力来让球队团结。

He was upset when he discovered that his dog was missing.

他发现他的狗不见时感到很难过。

The balloon flew upward after Isabel accidentally let go of it.

气球在伊莎贝尔不小心松手后往上飞了起来。

There has been an upward trend in students' grades this semester.

学生这学期的成绩有上升趋势。

My parents want to move away from urban areas and live someplace quieter.

我父母想要搬离城区、住到比较安静的地方。

Ted loves living in the country, but he sometimes misses the urban surroundings of his childhood.

泰德喜欢住在乡下，但他有时会怀念童年时的都会环境。

I have an urgent question that needs to be answered right now.

我有个紧急的问题，需要立刻得到解答。

This assignment is very urgent, so please complete it as quickly as possible.

这份工作很急迫，所以请尽快完成。

Try to increase your usage of English every day.

试着每天增加你的英语使用量。

Many words have different usages in American English and British English.

许多字在美式英语和英式英语中有不同的用法。