adj.集中的；聚合的
动词lump的过去式和过去分词形式.
The elephant lumped along beside me. 那只象在我身旁笨拙地走着。
The cost of these two trips can be lumped together. 这两次旅行的费用可以合在一起。
We've lumped all the advanced students into a single class. 我们把程度高的学生都编在一个班里。
