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。
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.
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.
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.
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.
基于蓝宝石的氮化镓发光二极管的一般内量子效率约为70%。
A gallium nitride LED on sapphire has a typical internal quantum efficiency of around 70%.
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.
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