As an application, we obtain an expression for the mean and variance of the first reaching time t.

作为应用，得到了首达时t的均值和方差的表达式。

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Knowledge of iron making penetrated into the forest and savannahs of West Africa at roughly the same time that iron making was reaching Europe.

大约在制铁技术传到欧洲的同时，西非的森林和大草原上也开始有了制铁的知识。

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If successful, reaching the outer side of space could be as easy as flying abroad in a few years' time.

如果成功的话，在几年内，到达外太空就像飞到国外一样容易了。

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Another time she would have ignored the desire for food until reaching her own home.

VOA: special.2009.09.05

The U.N.climate change talks opened Monday with warnings that time was running out on reaching a deal.

VOA: standard.2009.09.28

The company held back on acquisitions in 2010 and 2011 as Smallwood said the valuations of projects were simply too high at that time with silver prices reaching all time highs.

FORBES: INTERVIEW: 'Next Three Years Are Going To Be Exciting' -- Silver Wheaton CEO

Reaching Sossusvlei in time for sunrise can be tricky with park opening times.

BBC: A long road trip along Namibia��s coast

In fact, in a lot of places across the country, like Indiana, gas is reaching all-time highs.

WHITEHOUSE: Weekly Address: Clean Energy to Out-Innovate the Rest of the World | The White House