The largest terrestrial planet, Earth has a diameter only one quarter as great as the diameter of the smallest Jovian planet, Neptune, and its mass is only one seventeenth as great.

最大的类地行星地球的直径仅仅是最小的类木行星海王星的四分之一，而且地球的质量仅仅是其质量的十七分之一。

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The signaling in a plant is only superficially similar to the firing in a complex animal brain, which is more than "a mass of cells that communicate by electricity," Taiz said.

植物内部发出的电信号与动物复杂的大脑中发出的神经信号只是表面上相似，动物大脑不仅仅是“通过电信号交流的细胞群”，塔伊兹说道。

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The astronomers found an "X-ray mass" only a tenth of the mass found using the gravitational lens method.

天文学家发现“X射线估算的质量”仅有“引力透镜”方法估算的质量的十分之一。

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Out of all of these elements, we as a species have only reached a critical mass, or a basic level of 21st century competency, in the availability of educational resources.

FORBES: Education Unleashed: Now It's All Up To You

As a result, only the total mass of replacements would need to be estimated instead of a prediction of which specific components might be needed.

MSN: Future astronauts may rely on made-in-space parts

The new guidelines on weapons of mass destruction are only part of a broader European security strategy that is still being drafted.

ECONOMIST: Weapons of mass destruction