Synonyms for individual words can be found below.
«longstanding»
«mystery»
Sentences with «longstanding mystery»
- «The origin of the knee and other features remain longstanding mysteries,» Seo said. (sciencedaily.com)
- When Voyager 1 crosses that next boundary we will be poised to probe many longstanding mysteries.» (sciencedaily.com)
- Those atoms» origin in the ozone layer might also help explain a longstanding mystery about some grains of lunar soil brought back by Apollo astronauts. (sciencemag.org)
- (see all
sentences)