[数]直和

direct sums───[数]直和

direct rule───直接规则

direct dye───[染料]直接染料

direct hit───直接命中

direct tax───[税收]直接税（如所得税）

directs───指导

direct result───直接结果；直接效果

direct costs───[会计]直接成本；直接耗费

direct input───[计]直接输入

An integral extension construction of domains was also derived by using the semi-direct sum of rings.───同时，还证明了半直和的剩余类环是整环的一个整扩张。

We introduce the notion of topological direct sum, and get a representative theorem of inductive limit by topological direct sum and quotient space.───然后引入拓扑直和的概念，利用它和商空间给出一个归纳极限表示定理。

When a direct sum of lifting modules is lifting is studied here.───研究了提升模的任意直和在什么条件下仍是提升模.