The phrase "a rare link" is correct and usable in written English.
It can be used to describe a unique or uncommon connection between two things, such as ideas, people, or events.
Example: "The study revealed a rare link between diet and mental health that had not been previously documented."
Alternatives: "an unusual connection" or "a unique relationship."
In a city where many buildings are brand-new, cemeteries are a rare link to the past.
For the Dodgers, though, it was a rare link to a proud history of great pitchers, writes Bill Plaschke in The Los Angeles Times.
Not entirely unconnected writes the Rumours sensing a rare link between stanzas, Southampton are set to splash £5m of the Wayne Bridge money on West Ham weasel Jermain Defoe.
At a time when blacks despaired at the intransigence and violence of whites who barred them from voting, from most city jobs, from whites-only restaurants and from owning property in white neighborhoods, Dolphus Shields served as a rare link between the deeply divided communities.
Gi Joon's organisation provides a rare link between the two, offering companies a chance to pay and deliver charcoal briquettes to the capital's poorest households, to see them through the winter.
Three years ago, researchers made a rare link between depression and a gene that regulates the neurotransmitter serotonin: People with a short version of the gene, called 5-HTT, are more likely to become anxious or depressed when confronted with a bad experience--such as a death in the family--than are those with a long version (ScienceNOW, 18 July 2003).
On April 23, he said, he came across an extremely rare Link print and called the dealer, who confirmed that Ms. Link was the source.
And it is a city in transition, the traditional drink of boza that Mevlut sells is a rare remaining link to the past when everything else seems to be being torn down and rebuilt.
But beneath his delicate exterior and the swooping white hair he tames with a hot pink comb, Mr. Lewis remains a rare living link to the birth of rock 'n' roll, as well as a talent who continues to inspire devotion and fascination from younger admirers like Mr. Kreis.
Yet the instruments on the observatory's roof offer a rare physical link to one of China's least-known historical adventures: its ill-fated involvement in the first world war.China sent 140,000 labourers to the mud and barbed wire of the Western Front.
The forensic team probing the blasts have found a "rare chemical link" (Indian Express) between the July 13 Mumbai blasts and the Delhi High Court blasts, making them suspect the bomb-makers may actually be from the same "bomb-making school," if not the same terror group.
