球面

• One such surface is known as the pseudosphere .
  一个这样的曲面名为伪球面。
• Lines pierce the sphere in points .
  直线与球面相交为点。
• Many engineers shy away from spherical projection methods .
  许多工程师对球面投影法有畏难情绪。
• Successive wave fronts in this case form a series of concentric spheres .
  相继波前形成了一系列的同心球面。
• One highly successful approach utilizes a triplet aspheric lens array .
  一种很成功的方法是利用一个三合非球面透镜阵列。
• We say that a caustic is formed on the surface of the sphere at this distance .
  我们说，在这一距离的球面上形成了焦散。
• An equation for finding the center of gravity of an area can be derived from fig. 1-3 .
  由图1-3可以得到球面积重心的公式。
• What changes are necessary when a spherical curvature is introduced in the substrate ?
  当一个球面曲率引入基底时需要有什么改变？
• The aim of this chapter is to provide a brief survey of the fundamentals of spherical astronomy .
  本章将简述球面天文学的基本知识。
• Hence a full subshell has zero angular momentum and is spherically symmetric .
  于是，一个已经填满的支壳层的角动量为零，并且是球面对称的。