penta-,五,-gon,边,角,词源同knee,heptagon.
In nature, pentagonal symmetry is rare in inanimate forms. Packed soap bubbles seem to strive for it but never quite succeed, and there are no mineral crystals with true pentagonal structures. But pentagonal geometry is basic to many living things, from roses and forget-me-nots to sea urchins and starfish. [Robert Bringhurst, "The Elements of Typographic Style," 1992]
来自柯林斯例句
来自柯林斯例句
来自柯林斯例句
来自柯林斯例句
来自柯林斯例句