Translation of "combining" into Chinese

The term ‘explosives’ shall mean the combination of several substances and mixtures that produce an exothermic reaction upon initiation.

这是指化合各种物质和引爆时引起放热反应的混合物的爆炸物。

My writing desk, a place of dread: an incredible number of incredibly useful drawers - combined with incredibly little legspace.

我的书桌,一个可怕的地方:难以置信地多的,难以置信地有用的抽屉——合并在难以置信的一点伸腿的地方。