结合55篇参考文献，概述了近年来氧桥联、氰桥联、硫氰根桥联等多核配合物的研究进展状况。
This is a review with 55 references on the progress of oxo-, cyano-, thiocyanato- bridged polychromium complexes etc.
桥的出现本是自然之笔——小溪之上的一根原木，或大河之中一堆砾石。
The first bridges were made by nature itself — as simple as a log fallen across a stream or stones in the river.
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