1. It is common knowledge that smoking is considered one of the nation's leading causes of preventable death, but it's less widely known that cigarettes are also the leading cause of fatal fires.2. It is common knowledge that one plus two equals three.
common knowledgecommon knowledge = 常識
In contrast to the rugged impression of denim, the carefully selected flannel fabric features a delicate, soft texture. Flannel brings out a city woma's delicate taste in clothes.