n.下層(基礎(chǔ)；膠層；基層)

The story has a substratum of truth. 這故事有事實(shí)的基礎(chǔ)。

The soil has a substratum of rock. 這土壤下面有層石頭。

"The Old Yue substratum"in south dialects of Chinese comprises different types. 南方漢語里的“古越語底層”有不同類型的情況。

There was in the woman a substratum of the brute, and in the man the material for a blackguard. 那婦人就具有做惡婆的本質(zhì)，那男子也是個(gè)無賴的材料。

Effect of Culture Substrata on Seedlings of Rare and Endangered Plants from Limestone Regions. 不同栽培基質(zhì)對(duì)石山珍稀瀕危植物苗期生長(zhǎng)的影響。

The typical sampling devices for BBL fauna in dude sledges (for soft bottom) and traps (for hard substrata). 底邊界層動(dòng)物的采樣裝置主要包括滑橇式和陷阱式兩種類型。

adj.基礎(chǔ)的；基本的；根本的