一个一个

• City by city , day after day , but trust me , she can
  一个一个城市的来,一天天的来但相信我,她可以这样做
• Refuse to let your troubles multiply , just take them one by one
  别让问题堆积如山，一个一个着手解决。
• Baidu search , check one by one
  百度搜索，一个一个的查。
• We were called in one by one
  我们被一个一个地叫了进去。
• After class , the students left the classroom quietly one by one
  课后，学生们安静地一个一个地离开了教室。
• This is where we each take a turn
  我们一个一个轮流来