challenge
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Small mammals are powerful indicators of environmental health, yet tracking them has long been a challenge because many species occupy different ecological roles while looking almost exactly alike.
From Science Daily
The greater challenge lies in transforming that captured gas into something useful, a step that is essential if carbon capture technologies are to be widely adopted.
From Science Daily
He attracted followers eager to make their name by challenging the scientific consensus on HIV and AIDS.
From Los Angeles Times
But with the rise of speculative or fake tickets, like the ones Balentine and Cottrell bought, securing valid tickets from the resale market has become more challenging.
From Los Angeles Times
But the thing about it is, everyone is so different and unique with what they actually struggle with and what is going to be their challenge.
From Los Angeles Times
From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.