用阿基米德螺线能成功地解决化圆为方的问题,方法很简单.A neat solution of the quadrature problem can be achieved with the spiral of Archimedes.现在的密封槽型比较常用的是对数螺线槽.Now the commonly used seal groove is a logarithm spiral groove.螺线齿轮被用于传送在平行的轴之间的行动.Hel...
在英国杜鹃鸟是报春的使者.In England the cuckoo is the herald of spring.杜鹃鸟预告春天的来临.The cuckoo is the herald of spring.在英国杜鹃鸟预示春天的来临.In England the cuckoo is the herald of Spring....