| 释义 |
▪ I. preˈcess, v.
[f. L. præcess-, ppl. stem of præcēdĕre to precede.]
†1. trans. To precede, to take precedence of. Obs. rare.
1529Frith Epist. to Chr. Rdr. Wks. (1829) 459 Yet chiefly..this warning precessed (in my judgment) all other words, where he exhorted us.
2. intr. To undergo precession.
1892A. M. Worthington Dynamics of Rotation xiii. 135 The application of the couple is said to cause the spinning wheel to ‘precess’. 1902Jrnl. Inst. Electr. Engin. XXXII. 83 The pull of gravity on a spinning-top does not make it topple over, but makes it precess. 1942Synge & Griffith Princ. Mech. xiv. 418 A disk, 6 inches in diameter, is mounted on the end of a light rod 1 inch long and spins rapidly. It precesses once in 15 seconds. 1957Endeavour Oct. 185/2 In each of these levels the nucleus precesses about the direction of H0, but maintains its correct orientation in the field. 1971I. G. Gass et al. Understanding Earth vi. 90/2 The axis of figure starts to precess about the axis of rotation. 1973[see precession 3 c]. 1975Nature 20 Feb. 590/3 When a single 3He atom is placed in a magnetic field its nucleus..precesses about the field direction in one of two permitted states, corresponding to two different energy levels. 1977A. Hallam Planet Earth 30/2 The satellites precess, or progressively change their orbiting path relative to the Earth's axis, due to these broad variations in the gravity field.
▪ II. precess
obs. form of preses. |