Sentence examples for challenges have appeared from inspiring English sources

Several new challenges have appeared for intermediate and advanced skiers.

Many recognized pathogens are of great concern today and new challenges have appeared in the recent years as the role of the interaction between pathogens during infection.

Pretreatment processes are designed to break down the cellulose, hemicellulose and lignin matrix, releasing monosaccharides and providing access of polysaccharides for enzymatic conversion and they often result in the introduction of toxic compounds which are also inhibitory to microbial fermentations [ 1- 6], and so the two challenges have appeared to be mutually exclusive.

But a new challenge had appeared this year.

Delegates in both cities have occasionally broken into dancing, and rhythm's challenge has appeared bipartisan.

Recently, several new buses have appeared to challenge more established ones for the business of ferrying Fujianese immigrants to East Broadway from up and down the East Coast.

Over the past few years, a number of studies have appeared which challenge the mitochondrial theory of aging.

This one's a toughie, so I hope a few of you out there have appeared on University Challenge... Quiz Question Three Academics have a certain way with words, and have even inspired the twitter account Shit Academics Say.

Much of the new research is due out soon or is still in progress, but in the last year a few influential books have appeared that have challenged previous scholarship largely by adding the texture made possible by extensive research in the country.

Urban problems have appeared.

While the Bush camp has struggled not to appear panicked by the strength of Mr. McCain's challenge, the senator has appeared so confident about his prospects that on his campaign bus on Tuesday he entertained questions from reporters about whether he would include a Democrat in his cabinet.