开普勒在观察TrES - 2b和它的恒星时，只发现了很轻微的光线明暗变化，不过足以确定一颗跟木星体积相当的巨大气体球就是原因所在。
Watching TrES-2b and its star, Kepler detected only the slightest such dimming and brightening, though enough to ascertain that a Jupiter-size gas giant was the cause.
因为这些计算非常复杂，而且哪怕是公式和参数中的轻微缺陷都会造成巨大影响，因此使用正式定义的计算机程序是非常必要的。
The complexity of these calculations and their susceptibility to even minor flaws in either formula or parameters makes having a formally defined program very important.
第八课：罗马所有的大使馆人员都认为这些轻微犯罪是个巨大的问题而且这些犯罪人员常常会用几个小时的临时证明来更换他们的护照。
Lesson 8: All embassies in Rome are well aware that petty crime is a huge problem and can often replace passports with a few hour's notice.
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