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单词 half sphere
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half sphere
half sphere n. a hemisphere.
Π
1538 T. Elyot Dict. Horizon, tis, a cerkle dyuidynge the halfe sphere, or ouer part of the firmament, from the other halfe, where, to our syght, it seemeth that the heuen toucheth the erthe.
1611 B. Jonson Catiline i. sig. B1v Let..Day, At shewing but thy head forth, start away From this halfe-Spheare.
1770 W. Guthrie New Geogr. Gram. p. vii Another circle representing the bounds betwixt the two hemispheres, or half spheres.
1843 Commissioner 342 A ‘bull's-eye’..that is a thick, green, half sphere of ground glass.
2013 Press (Christchurch, N.Z.) (Nexis) 4 Dec. 19 The dome needs to be a perfect half sphere in order to reflect heat from all sides directly into the centre of your oven.
extracted from halfadj.
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