The story has a substratum of truth.

这故事有事实的基础。

There is a broad substratum of truth in it.

这其中有广泛的事实做基础。

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。

The lithologic substratum is made of gravel, sand and clay with a layer of loess.

岩性底层是由砾石，沙质土，粘土与黄土层组成。

The film have good anti-abrasive and anti-reflexive function on the silicium substratum.

该膜对硅基底有很好的耐磨损和抗反射作用。