keystone怎麽讀

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keystone英語什麽意思：1.【鍵】拱頂石，冠石，塞縫石。2.【無線電】梯形失真(光柵)。3.要旨，根本原理。adj.吉斯通式的〔指類似吉斯通電影公司拍的庸俗喜劇無聲片，如描繪一群愚蠢無能的警察(Keystone Kops)瘋狂追捕的場面〕。