原子核的体积大约是原子的一万亿分之一。
此研究能够解释大爆炸后第一万亿分之一秒内所发生的事。
The research could explain what happened in the first trillionth of a second after the Big Bang.
这种方法能探测到脑细胞电活动发出的磁信号——一种信号的强度只相当于地磁场的一万亿分之一。
It detects magnetic signals that are produced by the electrical activity of brain cells—and which have about a billionth of the strength of the Earth's magnetic field.
这种方法能探测到脑细胞电活动发出的磁信号——一种信号的强度只相当于地磁场的一万亿分之一。
It detects magnetic signals that are produced by the electrical activity of brain cells—and which have about a billionth of the strength of the Earth's magnetic field.
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