"library"的适当形式是 libraries。当"library"表示复数概念时，其复数形式是在词尾加上"-ies"，变为"libraries"。例如：
1. She visits the local libraries every Saturday.
2. There are many libraries in this city.
3. The library has a vast collection of books.
"library"的适当形式是 libraries。当"library"表示复数概念时，其复数形式是在词尾加上"-ies"，变为"libraries"。例如：
1. She visits the local libraries every Saturday.
2. There are many libraries in this city.
3. The library has a vast collection of books.
