The windswept trees forming a kind of tunnel, the sun piercing through the upper layer of the fog and the limited visibility provide for a very special effect. It appears quite unreal.

被风刮的树木形成了某种特殊类型的隧道，太阳穿透了高层的雾，使有限的能见度提供了非常特殊的效果，看起来相当虚幻。

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It managers will need greater visibility into their enterprise networks to pinpoint potential problems before they effect performance and hamper e-business. Probes provide that necessary visibility.

将来，it经理们需要更清楚地看见其企业网络，在潜在问题影响性能、妨碍电子商务之前诊断出这些问题，探头提供了这种必要的可视性。

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The integral expression, (6), of the visibility function, on which the effect of the atmosphere is considered, is derived in this paper.

本文在考虑了大气影响的条件下、导出了可见度函数的积分表达式，（6）。

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The operator should use an independent risk evaluator for weather and other environmental conditions like volcanic ash or even heavy pollutants which can effect helicopter operation and pilot visibility.

FORBES: 10 Essential Checks Before You Step Into A Helicopter