Firmly secure the two uprights to opposite walls in the alcove and then fit the shelves in between them.先在两边墙壁的凹处固定住两根柱子，然后把搁板插进去装好。The uprights of the structure were embedded in concrete.建筑物的支柱牢牢地嵌在混凝土中。He kicked the ball through the uprights.他将球踢人球门。