Hi, boys and girls! Welcome to our museum. It's free. But we have some rules for you, please remember them and do as I say. First, don't have food or drink here. You may make our museum dirty. Second, you can take photos here, but don't touch(触摸)the things here. Third, keep quiet in the museum. Don't talk loudly(大声地) . Fourth, the museum is not open(开的) after five o'clock in the afternoon. Please leave before five. Have a good time here! Thank you!