Meaning and Usage
"有效" means "effective" or "valid." It is commonly used to describe something that produces the desired effect or is legally or officially recognized.
Common Contexts
- Legal or official validity: documents, tickets, coupons, or IDs that are accepted.
- Effectiveness: methods, treatments, or actions that work well.
Collocations and Patterns
- 有效证件 (valid identification): used to specify documents accepted for entry or verification.
- 有效期 (valid period): refers to the time frame during which something remains valid.
- 有效方法 (effective method): describes a method that works well.
Usage Notes
"有效" is often used attributively before nouns (e.g., 有效期) or predicatively (e.g., 这个方法很有效). It is more formal than some synonyms like "灵验" (effective in a spiritual or superstitious sense) and is appropriate in official or practical contexts.
Avoid confusing "有效" with "有效率" (efficiency), which focuses on the ratio of output to input rather than validity or effectiveness.