keystone
keystone 英 [ˈki:stəʊn] 美 [ˈkistoʊn]
n. 主旨，基本原则；[建] 楔石
名词复数:keystones
- In a curved stone archway, the keystone is the one at the very center of the top. The keystone is the most important stone, and that's why this word is also used figuratively to mean the most important part of anything.
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- n. 主旨，基本原则；[建] 楔石
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1. They’re what ecologists call a “keystone” species, who control the abundance every other species, but require a habitat of sufficient size to support those other creatures.
它们是生态学家所谓的“重点”物种，控制着大量的其它物种，不过它们需要足够大的栖息地以供养其它那些生物。
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2. The company promised reductions in rates of more than 20 percent, but after submitting our employees’ personal data, the rates turned out to be almost identical to what we were paying keystone.
这个公司所承诺的是降低至少20%的费用，但是在提交每名员工的个人资料以后，结果相比于我们所支付的“凯斯通”费用基本相同。
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3. I put this first because I think it’s the keystone habit that will help you form the other important habits.
我把这个习惯放在第一位，因为我认为这个习惯可以帮助大家培训其他的重要习惯。
- keystone (n.) "stone in the middle of an arch (typically the uppermost stone), which holds up the others," 1630s, earlier simply key (1520s), from key (n.1) in figurative sense of "that which holds together other parts," or from its Middle English architectural sense "projecting ornament of at the intersections of ribs of vaulted or flat ceilings" (mid-14c.). Being the last put in, it is regarded as "keying," or locking together, the whole structure.
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