4. You shoud return books on time.
5. You should leave the library before 6:00 pm. The library will be closed at 6:00pm
6.为确保图书馆的安全,禁止在阅览室内任何地点吸烟,严禁携带易燃、易爆物品入阅览室。
To ensure the safety of the library, no smoking is allowed in the reading room.
Inflammable and explosive materials are prohibited in the reading room.