Mother and son lost contact when Nicholas was in his early twenties.尼古拉斯20岁出头的时候母子就失去了联系。It was paid to her in greenbacks -- three twenties, six tens, and six fives.这份薪水是用绿色钞票付给她的 -- 三张20块, 六张10块, 还有六张5块.It was written i...
My late teens and early twenties were really rough years.我二十岁前后那几年过得真苦啊。It was written in the Twenties, but it still really stands out.它写于20世纪20年代，但直到今天仍然备受瞩目。Mozart clearly enjoyed good health throughout his twenties an...
地球既公转又自转.The earth revolves both round the sun and on its own axis.地球自转与地球绕日公转产生附加的频移.The earth's rotation and its motion around the sun add an appreciable frequency shift.月球的自转与公转精确地同步.In the case of the moon the r...