"Stars in the center of the Milky Way are old and 'metal-rich' with a high abundance of heavy elements," Bobrowsky said.
银河中心的恒星都比较古老，富集金属元素，重元素的丰度很高。
2
On Earth, for example, platinum and its allied elements, though rare at the surface, are reckoned more common in the planet's metal-rich core.
例如在地球上，铂和铂系元素在地表上虽然罕见，但人们认为在富含金属的地核里却是较为常见的。
3
A glacier next to a nearby zinc and lead mine has retreated since the site closed in 1990, exposing an outcrop of metal-rich ore, where drilling will start again soon.