单
这是一本单词书。
This is a single-word book.
single; sole; alone
他单独完成了这个项目。
He completed the project single-handedly.
这本书是单行本。
This book is a single-volume edition.
Used to describe something that is not accompanied by others or done alone.
odd (number)
这个数字是单数。
This number is odd.
Refers to numbers not divisible by two.
list; bill; form
请把账单给我。
Please give me the bill.
Commonly used in business contexts like invoices or receipts.
sheet (of paper)
他拿了一张单纸。
He took a sheet of paper.
Refers to a piece of paper or document.
Related Phrases
Pro Tip
Common Mistakes
Avoid confusing 单 (single/odd) with 单独 (alone) or 单词 (word). Each has distinct meanings and usage contexts.
Gold Rule
Usage in Numbers
When referring to numbers, 单 means 'odd' (e.g., 单数). Do not confuse it with 'even' (双数).
Word Origin
The character 单 (dān) originates from the Oracle Bone Script (甲骨文) and Bronze Script (金文), where it depicted a single-layered shield or a single object. Over time, its meaning expanded to include concepts of 'single,' 'sole,' and 'odd.'
Usage Notes
1. 单 can function as an adjective, noun, or adverb depending on context. 2. In financial contexts, 单 often refers to a bill or invoice (e.g., 账单). 3. When describing numbers, 单 specifically means 'odd' (as opposed to 'even').