So the letters came from an army camp

• 军中不断发来信件；从加州到越南

So the letters came from an army camp的用法和样例：

例句

1. She got a team of aeronautic engineers from Caltech to help her test the theory.
   她还从加州科技大学找来一批飞行学工程师帮她验证这个想法。
2. When I came back from California,I stopped over one night near the Grand Canyon.
   我从加州回来时，在大峡谷附近过了一夜。