keystone
发音
英 [ˈki:stəʊn]
美 [ˈkistoʊn]
-
- n.
- 重点
- 要旨
- 基本原理
- 拱心石
单词词源
keystone 拱顶石，主旨，要点
key,钥匙，关键，stone,石头。因拱顶石形如一把钥匙，同时也最为关键。引申词义主旨，要点。
双语例句
- 1. Transcanada is the company constructing keystone .
- 横加公司是公司建设重点
- 2. 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。
- 3. However , these reserve requirements were abolished by margaret thatcher in 1980 as a keystone in her free market revolution , so that by the late 1980s every control and regulation on city lending had been scrapped .
- 然而，在1980年，作为撒切尔夫人自由市场改革的重点措施之一，这些存款准备金已经被废止，因此，到20世纪80年代末每一次城市的贷款的管制都被取消了。