single/ 'sɪŋgl /

1.adjective
(solitary) 单个的

We heard a single shot.
我们听到一声枪响。
2.adjective
(individual) 唯一的

the world's single most important source of oil
世界上唯一最重要的石油来源
3.adjective
(unmarried) 单身的

a single woman
一位单身女子
4.adjective [+sheet] [ garage] 
(for one person,car etc) 单人的

5.noun [c] [BRIT] 
(also: single ticket) 单程票[美 = one-way ticket] 
6.noun
(record) 单曲唱片

not a single one was left
一个都没剩
every single day
每一天
single spacing
 [TYP] 单倍行距