The circle R is the mark of "registered trademark", which means that the trademark has been applied for registration at the National Trademark Office and has been reviewed and approved by the Trademark Office to become a registered trademark.

Life common sense refers to the scientific knowledge that people summarize in their daily lives, which can be divided into common sense in various aspects such as physics, biology, chemistry, medicine, first aid knowledge, geography, safety, cosmic bodies, natural phenomena, etc. content.