single plan of standard cost accounting

例句：

1. 1. The single most important thing is tobe honest.
   最重要的事情是诚实。
2. 2. She hasa single sister and a brother.
   她有一个姐姐和一个哥哥。
3. 3. There are only three starsin the sky; they are all single.
   天空中只有三颗星星，它们都是单独的。