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The 420 million Phoenix mission is analyzing the dust and subsurface ice layers of Mars ' arctic regions to look for signs of potential past habitability .

耗资4.2亿美元的凤凰号任务是分析火星北极地区的尘埃和表面冰层，以寻找从前可能存在的可居住的迹象。

When you have to hack through layers of packaging and plastic to get to your dinner, it's likely to be unhealthy, Zepeda says.

当你必须撕去包装和塑料，才能吃晚餐，很可能是不健康的，塞佩达说。

Finally, the transition location of the boundary layers on the cones with different flow parameters, such as the angle of attack, the cone half angle and the Mach number of the coming flow etc.

对于来流小攻角的锥体边界层，传统的e-N方法即使在定性上也不能给出正确结果。

The improved e-N method can also yield results well agree with those obtained by DNS.4 The transition prediction for boundary layers on cones with different key parameters such as angle of attack, cone half angle and the Mach number of the coming flow, have been made, to show the reliability of the modified e-N method.5 For the calculation of base flow, boundary layer equations can be used in the case of small angle of attack.

但是它要依赖于对初始扰动的正确预估，这显然又取决于更多飞行数据的积累和分析。e-N方法的转捩预测结果与直接数值模拟得到的结果也吻合较好。4通过对不同来流攻角、不同半锥角和不同马赫数的三维圆锥边界层的转捩位置进行预测，证实了改进的e-N方法对于三维边界层转捩预测是可靠的。5对于基本流的计算，边界层方程可以用于小攻角的情况，其计算量远远小于直接数值模拟，但背风面的剖面不可靠。

Layers of shielding materials,as well as the half-mile of rock above the experiment,are used to prevent most of the background particles from reaching the detector.

防护材料层和尝试仪器上方半英里厚的岩石用来阻挡年夜年夜都的布景粒子，使其不克达到探测器。

Be careful not to allow gaps or twists in the layers of the handrail.

要小心，不要让曲折的空白或层层扶手。

I personally saw one irate, hard-bitten southerner attempt to scale four layers of barbed-wire-wrapped metal barriers, before reason triumphed over emotion.

我亲眼目睹一位愤怒的南部民众试著攀越四层的铁拒马，但后来他的冲动被理性击败了。

Egg quality traits of 901 hens from a pureline of dwaf layers were measured at the age of 40 weeks, including egg weight, Haugh Unit, shell strength, shell color, shell thickness, egg shape index and yolk color.

结果表明：矮小型蛋鸡40周龄蛋品质性状蛋重、哈氏单位、蛋壳强度、蛋壳颜色、蛋壳厚度、蛋形指数和蛋黄颜色的测定结果分别为：53.80g、86.40、3.3 kg／cm~2、41.78、342.90 μm、1.40、6.8。

Hawley sketches for members of Congress 19 security steps the TSA employs before, during and after checkpoint screening."Each and every one of these 19 security layers is important and strong in its own right," he says."Linked together, they are effective and daunting."

他描述了安检的19个步骤，在筛选检查之中及后面的步骤对自身来说，19个步骤的任何一环都是重要和强大的，把它们很好地联系在一起，则会发挥出高效和令人畏缩的作用。

The headband consists of a sandwich design in which a metal layer is covered with several layers of plastic.

头箍设计成像三明治一样的复合结构。在内部，金属层被若干层塑料覆盖着。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失