substratum

['sʌb'streitəm]

n.基础, 根据, 下层, 底层

例句与用法：

Any of certain other wetland areas, such as a fen, having a peat substrate.

沼泽地区任一种其它的湿地，有泥炭底面，如沼泽

Aquatic animals that live in the substrate of a body of water, especially in a soft sea bottom.

底内动物生活在水体底部的水生动物，尤指栖于松软海底的水生动物

Microelectronic circuits in which the passive components and their metallic interconnections are formed directly on an insulating substrate and the active semiconductor devices(usually in wafer form) are added subsequently.

一种微电子电路器件，其中的无源元件及内部金属连线直接在绝缘衬底上形成，然后再加上有源半导体器件(通常以大圆片形式给出)。

词形变化：

形容词: substrative | 名词复数: substrata |

详细释义：

n.

1. 下层; 下层土壤

2. 基础