1630s, from Modern Latin substratum (plural substrata), noun use of neuter singular past participle of Latin substernere "to spread underneath," from sub- (see sub-) + sternere (see stratum).
实用例句
1. 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。
来自柯林斯例句
2. The best nutrition supply was basic substratum mixed with rapeseed cake liquid.