noun 下载 🔗分享 拱心石，拱顶石 The top stone of an arch. Examples : "The keystones at the top of the old stone bridge held the entire structure together. " 老石桥顶部的拱顶石支撑着整个桥梁的结构。 architecture building part structure 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 拱心石，基石。 Something on which other things depend for support. Examples : "In many successful projects, clear communication and strong teamwork are the keystones. " 在许多成功的项目中，清晰的沟通和强大的团队合作是基石。 structure building 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 宾夕法尼亚州人，宾州人 A native or resident of the American state of Pennsylvania. Examples : ""Many keystones travel to Philadelphia for the annual Pennsylvania Dutch Festival." " 许多宾州人前往费城参加一年一度的宾夕法尼亚荷兰人节。 state person 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 加倍定价，百分之百的利润。 (retail) A retail price that is double the cost price; a markup of 100%. Examples : "Many small retailers rely on keystones to ensure profitability, meaning they double their cost when setting the final price for their products. " 许多小型零售商依靠加倍定价来确保盈利，也就是说他们在设定产品最终价格时，会将成本翻一番。 business commerce economy finance 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 二游搭档，中线组合。 The combination of the shortstop and second baseman. Examples : "The team's keystones were excellent; their double plays consistently shut down the opposing offense. " 这支队伍的二游搭档非常出色，他们的双杀配合总能有效地压制对方的攻势。 sport position 与AI对话词汇游戏阅读练习
