noun 下载 🔗分享 船形饰品，船形器皿 An extravagant table ornament and container used in the Middle Ages and Renaissance, made in the shape of a ship. Examples : "The king proudly displayed his ornate silver nef, filled with spices, at the head of the banquet table. " 国王骄傲地把那个装饰华丽的银制船形器皿摆在宴会桌的首位，里面装满了香料。 art material utensil history royal food tradition 与AI对话词汇游戏阅读练习
adjective 下载 🔗分享 半正定的, 数值有效的 Of a line bundle on a complete algebraic variety over a field: such that the degree of its restriction to every algebraic curve in the variety is non-negative. Examples : "Because the line bundle's restriction to every curve in the complex surface has non-negative degree, we say the line bundle is nef. " 因为这个线束限制在复曲面上每条曲线上的次数都是非负的，所以我们说这个线束是半正定的 (ban zheng ding de) / 数值有效的 (shuzhi youxiao de)。 math theory 与AI对话词汇游戏阅读练习
