估计地球的年龄大约为46亿年。
The age of the earth is reckoned at about 4 600 million years.
我一年的行驶里程大约为1万英里。
地球离最近的恒星大约为4光年。
水的流速约为每秒1.5米。
马的怀孕期大约为十一个月。
这些植株分布均匀，间距大约为50厘米。
这两只都是中等大小的昆虫，翼幅大约为四厘米。
Both are moderately large insects, with a wingspan of around four centimetres.
为保证绝对安全，你需要一个花费约为两百美元的硬件。
To be totally secure, you need a piece of hardware that costs about $200.
地球的圆周约为25,000英里。
夏季，当地气温大约为26度。
中国南海的鲸落深度约为三米。
The whale fall in the South China Sea is about three meters long.
它供人们参观的面积约为12500平方米。
It is about 12,500 square meters in size for people to visit.
人脑的重量约为14公斤，但它能比大多数计算机存储更多的信息。
The human brain weighs about 14 kilograms, but it can hold much more information than most computers.
他说，其中一个电话亭每月的收入约为1.35万美元，而租金仅为400美元左右。
He said that one of the boxes generated around $13,500 in revenue a month and cost only about $400 to rent.
“每头牛的成本约为100美元。一头牛对一个家庭状况的重要性大于金钱。”马可说。
"Each cow costs about $100. One cow means more to the health of a family than money," says Marco.
这些金属的总价值估计约为520亿美元。
Together, the value of these metals is estimated to be about $52 billion.
为什么男女秘书的比例仍然约为1：99？
Why are there still approximately ninety-nine female secretaries for every one male?
美国每年的信用卡诈骗总额约为55亿美元。
American credit-card fraud amounts to about $5.5 billion annually.
制作一本新教科书的成本约为100万美元。
平均每位美国消费者在礼物上的花费约为805美元。
The average American consumer will spend about 805 dollars on gifts.
一家广告公司估计，今年它的价值约为1.38亿美元。
An advertising agency reckons it will be worth about $138 million this year.
在今天的中国，农业用水的利用效率约为30%-40%。
In China today, the utilization efficiency of farming water is about 30-40 percent.
全国平均农场面积约为440英亩，但他的农场只有一英亩。
The national average farm size is around 440 acres, but his is only one acre.
麦格纳广告代理公司估计，今年它的价值约为1.38亿美元。
Magna, an advertising agency, reckons it will be worth about $138 million this year.
如今仅剩约2.2万只鸟，栖息地约为该物种历史分布范围的16%。
Just some 22,000 birds remain today, occupying about 16% of the species' historic range.
当今世界上大多数发达国家针对大公司的企业所得税税率约为三分之一。
Most advanced countries of the world today have a corporate profits tax rate for large corporations of about a third.
根据电车咨询公司的数据，去年全球电动自行车销量约为3400万辆。
About 34 million ebikes were sold worldwide last year, according to data from eCycleElectric Consultants.
一个雪球目前体重1.5公斤，相比之下一只正常刺猬体重约为500克。
A snowball currently weighs 1.5 kg, compared to a normal hedgehog who weighs about 500 grams.
他们的收费是固定的，一般来说，一场标准的四小时演讲收费约为825美元。
They receive a fixed rate, which is typically about $825 for a standard four-hour vocal session.
据航空公司监测显示，美国7家大型客运航空公司机队的平均机龄约为14岁。
The average age of the fleet of the seven large U.S. passenger airlines is about 14 years old according to the airline monitor.
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