Earth is a bit closer to the sun in early January and farther away in July, although this variation has a much smaller effect than the heating and cooling caused by the tilt of Earth's axis.

地球在1月初接近太阳，而在7月远离太阳，尽管这种远近变化的影响比地轴倾角造成的冷暖效应要小得多。

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This could have weakened the greenhouse effect and cooled the Earth so much that the tilt towards the sun every 41,000 years no longer provided enough heat to melt the glaciers that formed in between.

这会减弱温室效应并给同时使地球降温太快，以致每4万1千年因太阳的倾斜也不能提供足够的热量来融化这时期的冰川。

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In ideal conditions, the effect of a tilt or a cave is exactly opposite for the two transmitters, so that an average gives the correct result.

理想条件下，对两个发射器来说，井眼的影响相反，因此平均后可以得到正确的结果。

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The fiscal cliff refers to the combination of automatic tax hikes and spending cuts that go into effect in January without action by Congress, and which may tilt the U.S. back into recession. (For explanation, click here ).

FORBES: ETF Securities' Brooks: Short-, Long-Term Gold Participants Can Have Varying Reactions To Fiscal Cliff