| 单词 | body axis |
| 释义 | > as lemmasbody axis body axis n. (a) each of a set of geometrical axes which define directions with respect to a three-dimensional object; (Aeronaut.) each of a set of rectangular coordinate axes having their origin at the centre of gravity of an aircraft and the x-axis along its longest dimension; (b) Biology a main line of growth, direction, organization, or symmetry within the body of an organism. Π 1830 Trans. Amer. Philos. Soc. 3 325 These expressions are the results of a skilful transformation of the general equations in the case of rotation round a body-axis which forms with its mean direction a very small but variable angle. 1906 Biol. Bull. 12 23 The abdomen is strongly extended so that the body axis is a straight line. 1984 F. J. Hale Introd. Aircraft Performance i. 4 The wind axes are not body axes; that is, they are not fixed to the aircraft other than at the cg [= centre of gravity]. 1993 New Scientist 24 Apr. 36/2 Genes in the Hox-D cluster, which define the head-to-tail body axis, are activated one after another and at a precise time during development of the embryo. < as lemmas |
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