When a large body strikes a planet or moon, material is ejected, thereby creating a hole in the planet and a local deficit of mass.

当一个大型天体撞击行星或月球时，物质会被抛射出去，从而在行星上形成一个洞，造成局部质量不足的现象。

youdao

The increased metabolic cost of possessing higher body mass contributes to the increased overnight mass loss.

更大的体重意味着代谢成本增加，导致了夜间体重损失增加。

youdao

The bigger the animal is, the lower its surface-to-volume ratio; for every ounce of body mass, there is proportionately less surface through which heat can escape.

动物体型越大，其体表体积比越低；躯体每增加一盎司的重量，所能散发热量的表面就成比例减少。

youdao

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

VOA: special.2009.07.21

Well that process of control to maintain a constant environment inside our body, whether it's an environment of constant mass or constant composition, or constant temperature, is called homeostasis.

这个控制过程维持着,体内环境的恒定,不论是内环境中物质的量的稳定,或者成分的稳定,或温度的稳定,这种状态叫做内稳态

耶鲁公开课 - 生物医学工程探索课程节选

First is the body mass index, you're going to see this a lot and you--some of you probably know about it already because it's out there in the popular literature.

首先是体重指数,我们会经常碰到这个概念,你们也许已经知道这个概念了,它经常在科普读物中出现

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Nearly one-third (31%) of us are clinically obese (body mass index of 30% or more).

FORBES: Age, Obesity, Lawyers--That's Our Health Care Crisis

Here are the alarming facts about obesity in the U.S.: Nearly one-third (31%) of Americans are clinically obese (Body Mass Index of 30 or more).

FORBES: Our Health Care Crisis: Age, Obesity, Lawyers

In all 31% of patients were obese - that is with a body mass index of 30 or more - they reported in Preventive Medicine.

BBC: Obese heart patients 'do better'