| 1. | From the monotonicity of the power addition along the central meridian line of the surface , methods for selecting the design parameters is discussed
从渐变镜片光焦度平缓变化的单调连续性出发，分析讨论pal镜片设计参数的选取方法。 |
| 2. | Just down the road is the national observatory at greenwich , which houses the meridian line and forms the standard from which the world ' s time zones are set
顺道而下便是穿过格林尼治子午线的格林威治国家天文台，且世界的零度经线以此而划分。 |
| 3. | It is called meridian gate because the emperor believed that the meridian line went right through the forbidden city and his imperial residence was the center of the whole universe
称为午门是因为皇帝想相子午线从紫禁城穿过，且他的居所是宇宙的正中。 |
| 4. | Since wende bridge locates on a meridian line , a wonderful view of a half moon by either side of it can be seen at midnight on november 15th every lunar year when the bridge moon hangs in the sky
李白投水捞月的故事，在人民群?中广?流传，很多文人墨客和学士名流也因文德桥畔的半边月慕名而来，曾?她写下了脍炙人口的篇章。 |
| 5. | Bearded and looking tired , a clearly emotional lewis crossed the greenwich meridian line at the royal observatory by carrying his boat with the help of supporters and cheering well - wishers
显然是会情绪溢于言表的刘易斯留着胡须，神情疲惫。在他的支持者和热心人们的帮助下，他抬着自己的船穿过位于皇家天文台的格林尼治子午线。 |
| 6. | Next , the soft method based on the dirichlet principle is given in detail . emphasis is put on the pattern of power addition along its main meridian line and the construction of the envelope of the nonrotationally symmetrical aspheric surface
其次，应用基于狄利克雷原则的软设计方法，重点阐述子午线光焦度渐增曲线形式和渐变包络面的构造方式。 |
| 7. | It is shown , through the analysis of their surface power and astigmatism , that the shape of the meridian line has significant influence upon the distributions of surface power and astigmatism . their keystone distortion is small . in this way , pal meeting different circumstances can be designed
最后，举例设计了光焦度增量为2 . 50m ~ ( - 1 )的几种渐变镜片，通过对设计结果分析研究，指出可得到梯形畸变较小的pal镜片，子午线光焦度渐增多项式参数的选取会影响镜片球面度和柱面度的大小和分布，由此，可设计满足不同使用要求的渐变镜片。 |
