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。

youdao

But rhis is the first time a quantum walk has been performed with two particles and the implications are far-reaching.

但是这是第一次用两个完全相同的光子来完成量子游走，这个试验意义深远。

youdao

The Serbs are looking to make history by reaching the quarterfinals for the first time.

塞族人希望此役能第一次突入四分之一决赛，开创历史。

youdao

Uzbekistan will next face either Australia or defending champions Iraq after reaching the semis for the first time, having made it to the last eight in 2004 and 2007.

CNN: STORY HIGHLIGHTS

He capitalised on his good fortune by reaching three figures for the first time since making a brilliant 143 not out against the same opponents at last year's World Cup.

BBC: SPORT | Cricket | Aussies hold off Pakistan

But Ormarsson was far more accurate in the 78th minute after coming on as a substitute just five minutes earlier, firing in a superb winner from 30 yards to give his side hope of reaching the finals for the first time.

BBC: Iceland U21 2-1 Scotland U21