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.
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.
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.
宇宙里动人心弦的影像，涵盖了错综复杂的尘埃带、明亮的星云星团，分散在我们银河中心星场。
The breathtaking cosmic vista shows off intricate dust lanes, bright nebulae, and star clusters scattered through our galaxy's rich central starfields.
宇宙里动人心弦的影像，涵盖了错综复杂的尘埃带、明亮的星云星团，分散在我们银河中心星场。
The breathtaking cosmic vista shows off intricate dust lanes, bright nebulae, and star clusters scattered through our galaxy's rich central starfields.
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