be filled with是表示被动，因为被动结构就是be加过去分词，be filled with“被装满，充满”
例如，Sedimentary rocks—the most common rock type near the surface—are also the most common reservoirs for water because they contain the most space that can be filled with water.
沉积岩——地表附近最常见的岩石类型——也是最常见的储水层，因为它们可以装水的空间最多。
