| 单词 | threshold |
| 释义 | threshold n. 1. a strip of wood or stone forming the bottom of a doorway and crossed in entering a house or room etc. 2. a point of entry or beginning (on the threshold of a new century). 3. Physiol. & Psychol. a limit below which a stimulus causes no reaction (pain threshold). 4. Physics a limit below which no reaction occurs, esp. a minimum dose of radiation producing a specified effect. 5. (often attrib.) a step in a scale of wages or taxation, usu. operative in specified conditions. Etymology: OE therscold, threscold, etc., rel. to THRASH in the sense 'tread' |
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