From that data, they've devised what they term the "habitability metric," a value representing a planet's temperature and mass that determines whether or not it can support life.

从这些数据中，他们设定了一个称为“可居住度”的值，代表一颗行星的温度和质量，决定了它是否能支持生命的存在。

youdao

It takes a weather-forecasting model of the atmosphere and injects particles of a specified mass and size at a particular place (the "source term").

它有一个天气预报的大气模型，并在一个特殊区域注入指定规模和大小的微粒(源项)。

youdao

Bezos was convinced it would take that long for Amazon to reach the critical mass of sales to sustain the company's model over the long term.

贝索斯确信，亚马逊将会花很长的时间实现关键性的大规模销售来维持长期的公司模式。

youdao

Carnival trades at a forward PE multiple4 of 16, with a forecast long-term growth rate of around 16% per year.5 This is an attractive trade off, in my opinion, particularly given the great dynamics of an industry riding the powerful, long-term currents of mass affluence and aging.

FORBES: Why Carnival Corp. May Be On Course For Smooth Sailing

Gregory Jette, an analyst at Jefferies in Paris, said Friday the company lacked mid-term prospects and the critical mass, possessed by the large players of the industry such as L'Oreal, to achieve substantial growth.

FORBES: Magazine Article

This is where the long-term viability of Windows as a mass market mobile OS will be tested in the coming summer.

FORBES: After Another Nokia Volume Surprise, Much Now Rides on Lumia 620