Sentence examples for a third theory is from inspiring English sources

A third theory is that the Russian government has some kind of hold over Trump.

A third theory is that investors are so convinced by the Fed's record as an inflation-slayer that they don't need higher rates on long-term bonds.

A third theory is that the overture to Trump was designed to put pressure on Hillary Clinton to follow through on her earlier pledge to debate Sanders in California.

A third theory is that Darwin suffered from the psychosomatic stress of knowing that his theory of evolution would distress his dear wife and the God-fearing Victorian public.

A third theory is that the plane's apparent climb to an altitude of 45,000 feet early after diversion might have been designed to incapacitate others on board by inducing hypoxia - oxygen deprivation - which quickly causes disorientation and unconsciousness and can lead to death.

A third theory is that giving the Kurds the crown jewel of Kirkuk – capital of a region with huge oil reserves – would be the first step in a set of carefully choreographed moves to reframe relations between Baghdad and the Kurds and drag the dysfunctional country from a state of permanent chaos.

But a third theory was (implicity) suggested by Osborne himself: that the Treasury remains unconvinced the UN-led process to agree international carbon cuts will work.

Therefore, a third theory was proposed that breast cancer arises primarily from the stem cell compartment and pregnancy may lead to protective changes in the stem cell population of the mammary gland.

A second theory is that the pebbles are clods of dust and that the force of the air bag pressing down simply pulverized them.

A second theory is that Mechel will be taken over by a state corporation run by one of Mr Putin's former secret-service colleagues.

A second theory is that although people may not be working with a full deck of information and beliefs, their preferences are dictated by something, and that something is élite opinion.