As a Chinese, if you don’t speak foreign languages, return to Beijing from Toronto, and have a layover in Cairo for 18 hours, it is usually not recommended to leave the airport to visit the pyramids. Airports usually have strict security regulations and visitors are not allowed to leave the airport area. In addition, the distance from Cairo to the Pyramids is relatively long, and even if time permits, it may be inconvenient due to issues such as security, transportation, and language communication. It is recommended that you rest or shop in the airport. You can also use this time to check whether there is any tourist information in the airport or consult the airport staff to learn about possible short-distance tour services. For safety reasons, it is recommended that you abide by the airport regulations.