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An estimated 99.85 percent of the mass of our solar system is contained within the Sun, while the planets collectively make up most of the remaining 0.15 percent.

太阳占据了太阳系总质量的大约99.85%，而在剩余的0.15%中，行星占据了大部分。

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They used a system of measurement called the Body Mass Index to define words like obese and overweight.

VOA: special.2009.07.21

system is the opposite of the open system, no mass and no energy can flow through the boundary.

孤立系与开系正相反，没有质量或能量,能流过它的边界。

麻省理工公开课 - 热力学与动力学课程节选

But they have really had a big scaling down of the mass transit system this year.

但是今年确实大幅度削减了公共交通。

纽约的公共交通 - SpeakingMax英语口语达人

The exhibit makes its case by presenting a variety of innovations, including mass-produced goods and the first known system of writing.

WSJ: The Ur-Metropolis | Uruk | Pergamon Museum | By A.J. Goldmann

Using the handle Flashboy, Ternovskiy soon mastered the art of the denial-of-service attack, wherein a target system is paralyzed by a mass of incoming communication requests.

NEWYORKER: Roulette Russian

Iraq has long had a date for when sanctions can start to be lifted: when it has handed over all its weapons of mass destruction and a monitoring system is in place to prevent them being rebuilt.

ECONOMIST: Settling with Saddam