Article
科學常識 游泳輔助器 - Common Knowledge in Science, Swimming Auxiliary

Column title: 科學常識 - General scientific knowledge
Subject matters: 新知 - new knowledge,
Language level: Baihua

Keywords: general knowledge,

Image
游泳輔助器 不諳水性者之福音 - Swimming Auxiliary, A Piece of Good New for People Who Cannot Swim

Subject matters: Illustrative diagram,
Medium: Painting-Western medium

Function: Related to Article/Ad

Keywords: sports, invention,