The principal kinds of sugar are: cane sugar or sucrose, grape sugar or glucose (C6H12O6), milk sugar or lactose (C12H22O11), and fruit sugar or levulose (C6H12O6).

• 糖的主要种类：甘蔗糖即蔗糖，葡萄糖即右旋糖（C6H12O6），奶糖即乳糖（C12H22O11），果糖即左旋糖。