図書館にはたくさんの

many … in the library

→ 図書館
phrase Rare #44,143
many … in the library A sentence frame that is followed by a noun; には marks the library as the place being talked about.
JA: 図書館にはたくさんの雑誌があります。
EN: There are many magazines in the library.

この図書館にはたくさんの本があります。

There are many books in this library.

図書館にはたくさんの本があります。

There are many books in the library.

図書館にはたくさんの学生がいます。

There are many students in the library.