龙骨—沿翼帆中心弦延伸的那根主结构管。

KEEL - main structural tube that runs along sail at center chord of wing.

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利用变换思想，对圆锥曲线教学中的一道例题进行分析，得出了各种圆锥曲线的焦点弦，并引伸其结论，将圆锥曲线的焦点弦变换为中心弦。

By using transformation thought, this paper obtains the focus chord of all kinds of conic section through analyzing a sample in conic section teaching.

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时代中心，让您领略风尚购物体验，用个性的购物理念触动您跳动的心弦。在此，携时代中心的全体工作人员衷心的祝愿您：购物愉快！

Times center making you have an extraordinary shopping experience that can be touch your heart with special shopping idea. Have a nice shopping time in our center. Thank you.

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Toni Morrison was speaking for black Southerners in that, I think, fantastic line in her novel Beloved which I know many of you've read because it's taught all the time but there's that marvelous little exchange at one point between Paul D and Sethe.

托尼.莫里森藉由她的小说《宠儿》中,用一句绝妙的句子表达了南方黑人的心声,我知道很多人都已经读过《宠儿》,因为这本书一直被当做教材,不过小说中男女主人公保罗和塞丝,有这么一小段触人心弦的对话

耶鲁公开课 - 美国内战与重建课程节选