Bluestone

[blu:stәun]

解釋/意思:

(noun.) bluish-grey sandstone used for paving and building.

編輯:塞格雷--From WordNet

解釋/意思:

(n.) Blue vitriol.

(n.) A grayish blue building stone, as that commonly used in the eastern United States.

整理:罗伯塔