| 单词 | time's arrow |
| 释义 | > as lemmastime's arrow time's arrow n. the direction in time (considered as a dimension) in which macroscopic processes and sequences of events obey physical laws; (more generally) the direction in which time flows; = arrow of time n. at arrow n. Phrases 1.British Astronomer Arthur Eddington (1882–1944) originally conceived of time's arrow as representing the apparent asymmetry of time with respect to physical laws, and thought it to result solely from the process of entropy. Most microscopic processes, however, exhibit no such asymmetry: they can be reversed without violating any physical laws. ΘΚΠ the world > time > [noun] > time's arrow arrow of time1917 time's arrow1928 1928 A. S. Eddington Nature Physical World iv. 69 I shall use the phrase ‘time's arrow’ to express this one-way property of time which has no analogue in space. 1972 S. Weinberg Gravitation & Cosmol. xv. 597 It is the expansion of the universe that, by providing a heat sink, sets the direction of time's arrow in thermodynamic processes. 1997 J. Updike Toward End of Time 80 Time's arrow points one way, toward an entropy when all seas have broken down all rocks. 2010 M. Bojowald Once before Time vii. 225 When one considers the partially microscopic character of our observations in the universe, entropy ceases to be a candidate for explaining time's arrow. < as lemmas |
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