His re-creation of the city is credible, with a substratum of fact to bolster the fiction.他对该城历史的再现是可信的，虚构的小说情节隐念着一些事实作为支撑。The best nutrition supply was basic substratum mixed with rapeseed cake liquid.营养供给以基本基质加菜籽饼水液为佳....
a level substratum水平的底层His recreation of the city is credible, with a substratum of fact to bolster the fiction.他对该城历史的再现是可信的，虚构的小说情节隐念着一些事实作为支撑。...its deep substratum of chalk...深厚的白垩地层The story has a substratum of trut...