The calculation results also showed that besides the relative ground clearance, the ratios of thickness and camber of wing profile have significant influence on the aerodynamics of WIGs.

同时，除相对飞高外，翼剖面的厚度和拱度对地效翼的气动力特性也有重要影响。进而，作者对应用CFD分析或辅助地效翼气动力风洞试验进行了探讨。

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A relative of jays and crows, nutcrackers hide pine seeds in the ground each autumn so they have a source of food during the Colorado Rocky Mountain winter.

星鸟属于松鸟和乌鸦的近亲，它在秋天的时候把松子藏在地底下，这样寒冷冬天的就有食物吃了。

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The group also looked at how life expectancies changed from 2000 to 2007, and found that 80 percent of counties were losing ground relative to the healthiest nations.

研究人员还分析了从2000年到2007年平均寿命的变化，发现80%的郡县都落后于最富裕国家。

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For GPS, this is an enormous issue because it turns out that the clocks on the satellites drift by almost 40, 000 nanoseconds per day relative to the clocks on the ground because they are high above the earth's surface (and therefore in a weaker gravitational field) and are moving fast relative to the ground.

BBC: Meet the world's director of time

Hispanics have gained considerable ground relative to whites, closing the dropout gap from 21 percentage points to 9.

WSJ: Best of the Web Today: The New Nixon

Thus, a spy plane could not be completely invisible if it were to be used for espionage or, indeed, flown at all, since its pilots would need to know its position relative to the ground.

ECONOMIST: How to weave a cloak that makes you invisible