First, a climate conducive to life on Earth depends upon the extraordinarily narrow orbital parameters that define a continuously habitable zone where water can exist in a liquid state.
首先，地球上适宜生命存在的气候取决于极其狭窄的轨道参数，这些参数定义了一个持续可居住的地带，在那里水可以以液态存在。
There are multiple ways to define a coordinate system for Earth coordinates; some are better for particular purposes than others.
有多种方式来定义地面坐标系统；有一些在某些用途方面比其他的更好。
And so the limits of Darwinian evolution will define the range of planets that can support life - at least Earth-like life.
因此，这种理论提出的各种限制条件将确定哪些行星可支撑生命——至少是类地生命。
Lake Eyre might be the bleakest, most featureless place on earth-a flat, arid salt sink in Australia with only the horizon to define its 3,700 square miles.
澳大利亚南部的艾尔湖可能是地球上最荒芜，最没有特色的地方了。这个澳大利亚低平的，荒芜的盐碱性湖泊有的只是地平线上3700平方英里的面积。
The first prediction model looks like the earthquake fault, those crusts in the earth cruse, define what is known as size M.
首先第一种模式看上去很像地震故障，在地球表面被撞击开来，为了发现地震的震级是多少。
Backpackers define themselves by traveling free of travel agencies, taking care of themselves all the way. With bags on back, they probe every corner of the earth at the lowest cost.
背包旅游者这样自我界定：不靠旅行社，一路上自己照顾自己，背着包，以最低的花费游览全世界。
Backpackers define themselves by traveling free of travel agencies, taking care of themselves all the way. With bags on back, they probe every corner of the earth at the lowest cost.
背包旅游者这样自我界定：不靠旅行社，一路上自己照顾自己，背着包，以最低的花费游览全世界。
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