The motion of variable mass system under variable force is studied using air track.

在气垫导轨上研究了变质量物体在变力作用下的运动规律。

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Discusses the dynamic theorem of mass system relative to centre of mass moving in a plane.

论述了质点系相对于随质心一起作平动的座标系的动力学规律。

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Based on variable mass system mechanics theory, the robotic system is regarded as a variable mass object.

基于变质量系统力学理论，将这一类爬壁机器人系统看作变质量物体。

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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

An open system, as the name describes, allows mass and energy to freely flow through the boundary.

开系，顾名思义，允许质量和能量自由地,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

Once you get funding for a mass system it can have all sorts of layers of user protection and sophistication in matching built in.

BBC: Future visions: A new way for e-commerce

Supermarkets and the mass food system are here to stay and they provide affordable food for the masses.

FORBES: The Summer Bounty from Farm to City

In Paris in the Twentieth Century, published for the first time in 1994, Verne described fax machines, gas-powered cars and an elevated mass transit system.

FORBES: Eerily Prescient