虽然你不知道相机的脉冲模式闪存如何运转，但你会说服自己以防万一还是购买这个额外的东西。
You don't even know how a camera's burst-mode flash works, but you persuade yourself to pay for the extra feature just in case.
通过对该恒星脉冲调制的观察，西尔·沃蒂博士推断此恒星周围有一颗围绕其运转的行星。
By looking for changes in this pulsing of the star, Dr Silvotti deduced that a planet was orbiting it.
之前人们曾报道过另外三颗据信由岩石组成的太阳系外行星，但是，它们是围绕着一颗脉冲星(恒星爆发后遗留的发光的残存物)运转的，而不是一颗常态的恒星。
Three other extrasolar planets believed to be of rocky composition have been reported, but they orbit a pulsar - the flashing corpse of an exploded star - rather than a normal type of star.
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