(US 美 obstacle course) noun [C] an area of land with many objects that are difficult to climb, jump over or go through, which is used, especially by soldiers, for improving physical skills and strength 练兵场
assemble/əˈsembl ||; əˈsɛmbḷ/verb1 [I,T] to come together or bring sb/sth together in a group 集合；聚集；收集: I've assembled all the information I need for my essay. 我已经收集了写文章所需的一切资料。
2 [T] to fit the parts of sth together 装配；组装: We spent hours trying to assemble our new bookshelves. 我们花了几个小时试图把我们的新书架安装起来。