[译] 光学玻璃是由高纯度原料：沙子、石灰、纯碱制成的。
[误] Optical glass is made of raw materials-sand, lime, and soda of the highest purity.

[正] Optical glass is made from raw materials-sand, lime, and soda of the highest purity.
[注] 表示"由……制成"时,物质发生物理变化者,用be made of,例如:The book shelf is made of wood.这书架是木制的。物质发生化学变化者,用be made from,如: Wine is made from grapes.酒由葡萄酿成。