sources是什么

sources是什么 coherent sources是什么? sources是什么意思? acknowledge sources什么意思 sources/sinks什么意思 evaluating sources是什么意思 offical sources什么意思 citing sources是什么意思 US sources是什么意思? sources disclose是什么意思 funding-sources是什么意思 industry and labor sources vegetarian sources 如何翻译 remain what little food sources are available这里的what做什么次用?这是什么从句? Sources of Information 的作文 preterintentional sources 来源于历史论文,讲的是史料,有“intentional”sources 和preterintentional sources （新概念4）第38课：下句中的themselves指的是什么?做什么成分?Contamination of water supplies is usually due to poor sanitation close to water sources,sewage disposal into the sources themselves,.但原句中的themselves的位置 （新概念4）第38课：下句中的themselves指的是什么?做什么成分?Contamination of water supplies is usually due to poor sanitation close to water sources,sewage disposal into the sources themselves,leakage of sewage into distribution