Sentence examples for not definitely known from inspiring English sources

"It's not definitely known what's triggering the higher smoking rates in this population".

Therefore, it is not definitely known that connections to aversive centres punish the animal for biologically wrong behaviour, but it is thought that correct behaviour is rewarded by pleasure provided by neurons of the brain.

The origin of bridge whist is not definitely known, but a similar game appeared in Constantinople before 1870, under the name khedive, and almost the same game had been played in Greece before that.

But a hard-to-shake melody can be a burden rather than a welcome souvenir, turning into what is called an earworm, and the reasons are not definitely known.

The volumes of the several Hebrew standards of liquid measure are not definitely known; the bat may have contained about 37 litres (nearly 10 U.S. gallons); if so, the log equaled slightly more than 0.5 litre (0.14 U.S. gallon), and the hin slightly more than 6 litres (1.6 U.S. gallons).

The melting and boiling points of ununseptium are not definitely known.

On the issue of the size of the civil service, Sir Jeremy told the cross-party committee he did not "definitely" know if Mr Hilton was behind the stories suggesting civil service numbers could be slashed by between 70% and 90%.

It is hence necessary to identify cases where the first steps of divergence appear, even if one can not definitely know whether it will eventually end with a true species separation [ 10- 13].

The factors involved in limiting the growth of an organism are not yet definitely known, but evidence indicates that the liver releases into the bloodstream protein molecules that can limit growth of the organ.

Although the exact patho-physiology of multiple organ dysfunction syndrome is not yet definitely known, alterations in systemic hemodynamics, organ perfusion and tissue microcirculation resulting in tissue hypoxia appear to play a key role in the onset and maintenance of this syndrome.

If, however, property is given to one for his life, the property to go to his heirs at his death, the interest in the property given to his heirs is a contingent remainder, because his heirs will not definitely be known until his death.