Paperboard is seen daily as box lunch containers, cardboard boxes, and even building materials.

纸板可见于日常的午餐盒、硬纸箱、甚材料。

Some books—printed on paperboard and intended mainly for under-twos—aim to teach the Roman alphabet to infants.

一些印刷在纸板上，适于两岁及以下的儿童读物然旨在教那些婴儿罗马字母表。

Thinking that way led him to one of his first and most fundamental breakthroughs, a guitar he produced in paperboard in 1912, then in metal two years later.

以这种方式思考现了的第一个也是最根本的突破之一，在 1912 年用纸板制作了一把吉， 然后在两年后用金属制作。

(5) Thinking that way led him to one of his first and most fundamental breakthroughs, a guitar he produced in paperboard in 1912, then in metal two years later.

这样思考引领了最早的也是最重要的突破之一，即在1912年用纸板制作的吉，两年后又用金属制作了这款吉。