number of extra width

例句：

1. 1. The extra effort will pay off in the end.
   额外的努力最终会得到回报。
2. 2. Extra care is needed for this delicate piece of art.
   对这个精致的艺术品需要额外小心。
3. 3. Extra time was given to finish the project on time.
   为了按时完成项目，给予了额外的时间。