请哪位高手帮我翻译一下? 把“氢回收投用前流程图”翻译成英语 : process flow diagram upstream the hydrogen recovery unit(流程图不存在投用与否,译成装置或单元即可) 把“氢回收投用后且氢碳比优化后流程图”翻译成英语: process flow diagram downstream the hydrogen recovery unit and h/c ratio optimazatoin unit 把“氢回收投用前及投用后且氢碳比优化后运行情况”翻译成英语:operational aspect of the follwong(or twocase) cases: the hydrogen recovery unit shutdown case, the the hydrogen recovery unit and h/c ratio optimazatoin unit onstream case. 如果上述流程图指的是带仪表控制点的流程图即pid图,则可译成piping and instrumentation diagram. 查看更多