substratum

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。

柯林斯例句

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.

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The story has a substratum of truth.

这故事有事实的基础.

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