例句與造句

1. the simulation model for water resources system based on macro-scale dual water supply is established herein by taking the large water resources system of multi-water-source; multi-consumer; multi-step series-parallel connection as the study object, so as to provide the technical support for realization of the rational allocation of water resources
   摘要以具有多水源、多用戶、多級(jí)串并聯(lián)的大型水資源系統(tǒng)為研究對(duì)象，建立基于宏觀尺度分質(zhì)供水的水資源系統(tǒng)模擬模型，為實(shí)現(xiàn)水資源合理配置提供技術(shù)支持。
2. It's difficult to find step series in a sentence. 用step series造句挺難的