基本解释：亿万分之(几)
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One of a trillion equal parts.一万亿分之一一万亿个相等部分中的一个
a metric unit of length equal to one trillionth of a meter.公制长度单位等于一米的万亿分之一。
a unit of capacitance equal to one trillionth of a farad.电容单位等于一法的万亿分之一。
One trillionth(10-12) of a second.皮可秒，微微秒万亿分之一秒（10－12）
He made a map of the world at one ten trillionth scale.他绘制了一张1 比l 万亿分之一的世界地图。
A nucleus is about one billionth the size of an atom.原子核的体积大约是原子的一万亿分之一。
One trillionth(10-12) of a farad.皮可法拉，微微法拉万亿分之一法拉（10－12）
The key to this process is the speed at which it occurs--less than one-trillionth of a second.关键在于这一过程发生的速度，时间少于万亿分之一秒。
Quantum mechanics, on the other hand, deals with phenomena on extremely small scales, such as a millionth of a millionth of an inch.另一方面，量子力学解决的问题是极小尺度里的现象，例如万亿亿分之一英寸。
One NM is one-1 billionth meter.一纳米是十亿分之一米。
Ns [Nanosecond]毫微秒[十亿分之一秒
Over nine-tenths of her inhabitants belong to the Han nationality.在这四亿五千万人口中，十分之九以上为汉人。
Ten percent of the state budget is equal to over 20,000 billion yuan.如国家预算节省百分之十，就是二十多万亿元。
In those five years the gross industrial output value amounted to more than 6 trillion yuan, with an average annual growth rate of 21.7 per cent.这五年，共创造工业总产值六万多亿元，平均每年增长百分之二十一点七。
Only 1 percent of the country's 560 million city dwellers breathe air considered safe by the European Union.这个国家的5亿6千万城市居民中仅有百分之一的人呼吸到欧盟认为的安全的空气。
Our portfolio includes more than65 million square metres(700 million square feet) of real estate under management and approximately US$21.5 billion of assets under investment management.本行之业务组合包括管理逾六千五百万平方米（亿万平方尺）物业，涉及资产二百一十五亿美元。
Last but not least are frequencies around a billionth of a billionth of a Hertz.最后一个频率范围是在几十亿分之一的几十亿之一赫兹。
As for steel, to meet our needs we have to produce 100 to 120 million tons a year.钢要有一亿到一亿二千万吨才够用，
