be about

I judged him to be about forty.

我估计他40岁上下。

She would be about 60 when she died.

她死时也许60岁.

I'm as positive as I can be about it.

我对它有绝对的把握。

I don't know the exact number of people who have been invited but off the top of my head I should think there will be about forty.

我不知道被邀请者的确切数字，但不用思索我认为会有40人左右。

I should suppose him to be about twenty.

我猜他是二十岁左右.

Looking still further ahead, by the end of the next century world population is expected to be about ten billion.

再往前看，到下个世纪末世界人口预计将达约100亿。

I would be about ten when my brother left home.

我哥哥离开家时,我大概十岁左右.

The Paris talks will mainly be about procedural matters.

巴黎会谈将主要围绕程序上的事宜。

The savings due to increased health would be about 2 billion annually.

由于增进了健康,每年节约为20亿美元左右.

The depth of the crater is expected to be about 30 feet.

弹坑的深度预计约于30英尺.

Toni reckoned that it must be about three o'clock.

托妮估计当时肯定是3点钟左右。

Oh, let's see. It'll be about 3:30 before we have anybody free.

哦, 让 我 想想. 大概要到3:30我们才有空.

Pisa is believed to be about three thousand years old.

据称比萨大约有三千年的历史.

I should suppose him to be about fifty.

我猜想他大约50岁.

We estimated his income at / to be about 8000 a year.

我们估计他一年的收入大约8000英镑.