马西博士怀疑，他的这个拥有地球质量四十五倍的新发现星体有一个岩层核心构成，并被一层很厚实的氢气与氦气层笼罩。

Dr Marcy suspects that his new discovery, which has about 45 times the mass of the Earth, is composed of a rocky core surrounded by a thick envelope of hydrogen and helium gas.

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美国现在的人口大约是十五世纪佛罗伦萨的一千倍.

There are roughly a thousand times as many people alive in the US right now as lived in Florence during the fifteenth century.

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一件开场前仅重200克的球衣在四十五分钟后居然会增重两点五倍。

A shirt that weighed 200 grams at the beginning of a match can weigh up to two-and-a-half times as much just 45 minutes later.

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