这个公式用于计算圆的面积。This formula is used to calculate the area of a circle.地球是圆的是常识.It is common knowledge that the earth is round.圆的直径与圆周有相互关系.The diameter and the circumference of a circle correlate....
I am old enough to remember the Blitz, but only just.伦敦空袭那阵我已开始记事，但也只是仅仅有些模糊的印象。During the blitz we spent the night in underground shelters.空袭期间,我们在防空洞过夜.He careened through foreign territories on a desperate kind of bli...