alternately是什么意思?

alternately的中文含义详细解释：
ad. 交替地,隔一个地
alternately的列举例句：
An ancient method of writing in which the lines are inscribed alternately from right to left and from left to right.
交错书写方法一种古代的书写方法，其中每一行交替地自右至左和自左至右书写

A jump in ballet during which the dancer crosses the legs a number of times, alternately back and forth.
空中交叉跳跃一种芭蕾舞动作，舞者在空中多次前后交叉双腿