“keystone”的概念、定义、翻译、参考文献-科学参考

单词	keystone
释义	keystone [`kē´stōn] ^ARCHITECTURE Wedge-shaped stone at the crown of an arch. ^MATERIALS Small crushed stone used as filler for the large aggregate in bituminous bound roads.
随便看	union cloth union dye Unionidae union joint union rule of probability union shop unipath unipolar Unipolarina unipolar machine unipolar transistor unipole unipotential cathode unipotential electrostatic lens uniprocessor unique factorization theorem unit unit-area acoustical ohm unitarity condition unitary air conditioner unitary decuplet unitary group unitary matrix unitary octet unitary space

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