three laws三个规律threenum.三n.三；三个adj.三个的Three Hundred Pounds Of JoyThree-dimension technique三维技术three Ci Poets in Guangdong粤三家three theoretical paradigms三大范式three phase local hold-up三相局部含率Three Pieces for Solo Cello大提琴独奏曲三乐章three-agriculture problem三农问题three-dimensional pattern三度空间模式three-character principle信达雅three-dimensional contact三维接触

1. About seven tenths of the earth's surface is covered with water while three tenths of it is covered with land.
   地球表面约有十分之七布满了水，只有十分之三的地表为陆地所覆盖。