词汇 | keystone state |
词源 | Keystone State. A nickname for Pennsylvania since at least 1803, when it was first recorded. Pennsylvania also has been called the Quaker State, the Steel State, and the Oil State. Key- stone was chosen because Pennsylvania was the keystone of the arch that the original 13 colonies loosely formed. |
随便看 |
英语词源词典收录了13259条英语词源词条,基本涵盖了全部常用英语词汇的起源、历史,是研究英语词汇或通过词源学英语的必备工具。