He turned his head and looked at the others who were all watching down their sectors of the slope. 欧内斯特·海明威.丧钟为谁而鸣.
In the accompanying diagram, the ends of the flat silvered glasses _a c_, _b c_, are inclined at an angle of 60 degrees; therefore the circle is completed by the junction of six sectors. 弗雷德里克·科利尔·贝克维尔.伟大的事实.