The orange tip shows up well against most backgrounds.橙色的尖端在大多数背景下都很醒目。The guests came from all social backgrounds...客人们来自各个社会阶层。Their cultural backgrounds gave them a spirit of adventure.他们的文化背景赋予了他们一种冒险精神。The Black chu...
他算出了他们活期存款账户上的余额总和。He figured up the balance in their checking account.三角形内角总和为180度。The sum of all the angles of a triangle is 180 degrees.他有事总和朋友推心置腹地拿出来谈。He always talked things over with his friends....