Caution! The site can't guarantee, that text has age permission. The site is not recommended, if you are less than 18 years old.
The site shows example sentences for English words. How the word or phrase could be used in a sentence?
" ... In 1902, Simon Newcomb, professor of mathematics and astronomy at Johns Hopkins University and in the United States Navy, said: "Flight by machines heavier than air is unpractical and insignificant, if not utterly impossible.” ... "