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Spam levels are down 24% from the third quarter of 2009 and 16% from the second quarter of 2010 while virus levels jumped 10% and 42% during the same periods respectively.

自2009年三季度以来，垃圾邮件的数量下降了24%，自2010年二季度以来，垃圾邮件的数量下降了16%，而与此同时，在相同时期内，病毒数量分别升高了10%和42%。

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The third one, the law of periods, allows us to establish a clear relationship between a planet's orbital period and its distance from the sun.

开普勒第三定律，也即调和定律，清楚地表明了行星公转周期与其离日距离之间的关系。

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"The great part about Nash right now is his third periods are his best periods, " Rangers coach John Tortorella said.

WSJ: Nash, Gaborik rally Rangers past Islanders 2-1

Chicago killed all four San Jose power plays, all of which occurred in a span of under 14 minutes late in the second and early in the third periods.

NPR: Blackhawks Set NHL Record With 2-1 Win Over Sharks

The key moment of New York's latest win might have occurred off ice between the second and third periods, when coach John Tortorella and the team discussed the Rangers' struggling power play.

WSJ: Rangers hang on to beat Caps 4-3, tie series 2-2