How to Use "keystone" with Example Sentences
- 1. Transcanada is the company constructing keystone .
- 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 .
- 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 .