The principles of fuel cell operation were first reported by British scientist Sir William Grove in 1839.

燃料电池的工作原理是英国科学家威廉·格罗夫爵士于1839年首先报告的。

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One of the first principles of probability theory is called the multiplication rule.

概率论的基本原理之一叫做乘法法则。

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As Petraeus knows, one of the first principles of counter-insurgency doctrine is that any successful campaign must have a credible local partner.

NEWYORKER: General Principles

He points to one of the most time-tested principles in science: the first law of thermodynamics.

FORBES: Powered By Blarney?

His plan, said aides, was to relaunch his party, the Freedom People (PdL), on the basis of the free-market principles he espoused when he first entered office in 1994, but which he signally failed to apply in the nine subsequent years when he governed Italy.

ECONOMIST: Italian politics