请帮我翻译以下内容：图1-14 aROD-SRU示意图90；b结构式为Cr2O-TZ4∞的之字形阶梯结构及其简化结构96；c扭曲梯棒状SBU和由此产生的irl拓扑97

Figure 1-14. (a) Schematic diagram of ROD-SRU [90]; (b) Zigzag ladder structure with the structural formula [Cr2O(-TZ)4]∞ and its simplified structure [96]; (c) Twisted ladder-like SBU and the resulting irl topology [97].