build up 逐步建立 The regime built up the largest army in Africa... 该政权逐渐建立起一支非洲规模最大的军队。 The collection has been built up over the last seventeen years... 在过去的17年中，收藏的规模不断扩大。 Slowly a thick layer of fat builds up on the pan's surface. 慢慢地，平底锅表面积起了一层厚厚的油脂。
