单词	keystones
释义	keystone noun key·​stone ˈkē-ˌstōn  1 : the wedge-shaped piece at the crown of an arch that locks the other pieces in place see arch illustration 2 : something on which associated things depend for support determination, a keystone of the puritan ethic L. S. Lewis 3 or keystone species : a species of plant or animal that produces a major impact (as by predation) on its ecosystem and is considered essential to maintaining optimum ecosystem function or structure Synonyms base basis bedrock bottom cornerstone footing foundation ground groundwork root underpinning warp warp and woof See all Synonyms & Antonyms Example Sentences Tourism is the city's economic keystone. the keystone of his faith Recent Examples on the Web The department did not respond to requests for comment about funding for the new positions, but in a budget proposal to the California Legislature the agency called beavers an important keystone species that could be used to combat climate change. Nathan Solis, Los Angeles Times, 7 Sep. 2022 In their view, both the mammoth and thylacine were keystone species in their respective ecosystems, which have been out of balance as a result of their loss. John Timmer, Ars Technica, 16 Aug. 2022 As a keystone species, sea otters help preserve our ever-important kelp forests by controlling the sea urchin population. Matt Pawlik, Los Angeles Times, 4 Aug. 2022 An economic powerhouse, Taiwan is also a keystone of the electronics supply chain and perhaps the world’s most important source of advanced microchips. Paul Mozur, BostonGlobe.com, 2 Aug. 2022 As the heir of both the House of Tudor and the House of York, Arthur was a keystone in Henry VII's plan to maintain peace in the kingdom and prevent rival factions from rising against his claim to the throne. Lauren Hubbard, Town & Country, 24 May 2022 And the concept is quite provocative, since Demna has been such a keystone of the hype machine, with his Triple S sneakers and zillion-layer jackets and LOL-ish T-shirts. Rachel Tashjian, Harper's BAZAAR, 23 May 2022 Coyotes are often called a keystone species, which means their presence has a significant and positive impact on the natural environment. John Laidler, BostonGlobe.com, 12 May 2022 The research performed on his converted 126-foot Bering Sea crab vessel, OCEARCH, is helping to unlock the life history puzzle of great white sharks and other keystone species essential for the health of the oceans. Kirby Adams, The Courier-Journal, 12 May 2022 See More Word History First Known Use circa 1637, in the meaning defined at sense 1 Phrases Containing keystone keystone species keystone species Kids Definition keystone noun key·​stone ˈkē-ˌstōn  1 : the wedge-shaped piece at the top of an arch that locks the other pieces in place 2 : something on which other things depend for support keystones noun plural of keystone as in cornerstones an immaterial thing upon which something else rests a sense of history is the keystone to the city's draw as a tourist destination Synonyms & Similar Words Relevance cornerstones foundations bedrocks bases bases grounds roots underpinnings warps footings premises supports focuses warp and woofs theories frameworks groundworks assumptions buttresses cores substructures essences mounts justifications backbones infrastructures presumptions bottoms beds kernels rationales centers theses presuppositions bulwarks substrata props hearts braces touchstones anchorages shores warrants foci stays nuclei hubs suppositions seats premisses nucleuses souls eyes quintessences
随便看	holdable holdall holdalls holdback holdbacks holddowns holden holdenite holder holder in due course holder process holder-forth holder-on holder-ons holder-up holder-ups holders holders-forth holders-on holders-up holdfast holdfastness holdfasts holding holding (in)

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