| 单词 | atomic clock |
| 释义 | > as lemmasatomic clock atomic clock n. an instrument used as an extremely accurate type of clock and employing the frequency of radiation from atoms of caesium, rubidium, or another element, usually in a tunable microwave cavity.Since 1967 the second as a unit of time has been scientifically defined using a caesium atomic clock, rather than in terms of the length of the year; cf. second n.1 2a. ΘΚΠ the world > time > instruments for measuring time > clock > [noun] > other types of clock watch-clock1592 German clock1598 quarter clocka1631 wheel-clock1671 table clocka1684 month clock1712 astronomical clock1719 musical clock1721 repeater1725 Tompion1727 pulling clock1733 regulator1735 eight-day clock1741 regulator clock1750 French clock1757 repetition clock1765 day clock1766 striker1778 chiming clock1789 cuckoo-clock1789 night clock1823 telltale1827 carriage clock1828 fly-clock1830 steeple clock1830 telltale clock1832 skeleton clock1842 telegraph clock1842 star clock1850 weight-clock1850 prison clock1853 crystal clock1854 pillar scroll top clock1860 sheep's-head clock1872 presentation clock1875 pillar clock1880 stop-clock1881 Waterbury1882 calendar-clock1884 ting-tang clock1884 birdcage clock1886 sheep's head1887 perpetual calendar1892 bracket clock1894 Act of Parliament clock1899 cartel clock1899 banjo-clock1903 master clock1904 lantern clock1913 time clock1919 evolutionary clock1922 lancet clock1922 atomic clock1927 quartz clock1934 clock radio1946 real-time clock1953 organ clock1956 molecular clock1974 travelling clock2014 1927 Science 9 Sept. 226/2 What they call an atomic clock; by which they mean a single atom in a gas, emitting light of definite frequency. 1958 Times 14 Oct. 5/3 The caesium atomic clock, which is on exhibition at the British clock and watch industry's display in the Goldsmiths' Hall, London. 2003 Florida Entomologist 86 402/1 All times reported are in Eastern Daylight Saving Time on a 24-hour atomic clock. < as lemmas |
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