同義詞
1. a thing that indicates the state or level of something
- measure
- , gauge
- , barometer
- , index
- , mark
- , sign
- , signal
- , guide to
- , standard
- , touchstone
- , yardstick
- , benchmark
- , criterion
- , point of reference
- , guideline
- , test
- , litmus test
2. a gauge or meter of a specified kind
