单词	dipyramid
释义	dipyramid noun di·​pyramid (ˈ)dī+ : a crystal consisting of two pyramids base to base, the one geometrically a mirror image of the other with respect to the horizontal plane of symmetry dipyramids occur in the tetragonal, hexagonal, and orthorhombic systems and may have corresponding orthorhombic, tetragonal, ditetragonal, hexagonal, or dihexagonal symmetry Word History Etymology di- + pyramid
随便看	a good time a good/bad state of repair a good/great/lovely time a good/safe/sure bet a great deal a great deal of a great time a greater whole a growing belief that a hard act to follow a hard nut a hard nut to crack a hard row to hoe a hard/tough act to follow a hard/tough nut (to crack) a heart of stone a heaven on earth a helping hand a higher purpose a hill of beans a hop, skip, and (a) jump a hop, skip, and a jump a hop, skip, and jump A horizon a horse of a different color

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