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.
夏季，当地气温大约为26度。
地球的圆周约为25,000英里。
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.
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.
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.
其零售价大约为17800美元，且配有功能复杂的陀飞轮装置。
They retail for about US$17,800 and feature a sophisticated tourbillion mechanism.
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.
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.
现在，她每月在食品杂货上的花费约为200至300美元，不到她以前每月650美元支出的一半。
Now she spends about $200 to $300 a month on groceries, less than half of the $650 a month that she used to lay out.
地球的周长大约为25 000英里。
3/4处于工作年龄的美国人在工作，相比之下欧洲约为60%。
Three-quarters of working-age Americans work, compared with roughly 60% of Europeans.
租约为期21年，他们将信守合同直到期满。
The lease runs for 21 years, and they are committed to seeing out that time.
1922年独立时，这个国家的森林覆盖率约为1%。现在，森林覆盖率为11%，政府希望到本世纪40年代将这一比例提高到18%。
Roughly 1% of that country was forested when it became independent in 1922. Now forests cover 11% of the land, and the government wants to push the proportion to 18% by the 2040s.
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