| 单词 | null |
| 释义 | null adj. & n. --adj 1. (esp. null and void) invalid; not binding. 2. non-existent; amounting to nothing. 3. having or associated with the value zero. 4. Computing a empty; having no elements (null list). b all the elements of which are zeros (null matrix). 5. without character or expression. --n a dummy letter in a cipher. Phrases and idioms null character Computing a character denoting nothing, usu. represented by a zero. null hypothesis a hypothesis suggesting that the difference between statistical samples does not imply a difference between populations. null instrument an instrument used by adjustment to give a reading of zero. null link Computing a reference incorporated into the last item in a list to indicate there are no further items in the list. Etymology: F nul nulle or L nullus none f. ne not + ullus any |
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