billionth是什么意思

双语用例

• Males are attracted to the one-billionth of a gram of pheromones released by a female moth for location.

• The model scales the entire solar systemboth planet size and distances between themdown to one five billionth of its actual size.

• The negative gravitational energy of the earth, for example, is less than a billionth of the positive energy of the matter particles the earth is made of.

• An attogram is one-thousandth of a femtogram, which is one-thousandth of a picogram, which is one-thousandth of a nanogram, which is a billionth of a gram.

• A nanometer is one-billionth of a meter.

• The motor, the world's smallest electric motor, is just a nanometer (billionth of a meter) across (60,000 times smaller than the thickness of a human hair).

• Specifications call for a pulse of 100 billionths of a second, about a million times shorter than exposures achieved with a high-end conventional camera.

• The team cooled fermionic lithium-6 to less than 150 billionths of one kelvin above absolute zero using infrared laser cooling.