This amazing invention is a brain child of John Vaaler a Norwegian patent clerk in 1890.
1890年，这个非凡的发明诞生于挪威专利局职员John Vaaler的孩子手上。
He used to be a clerk, but now he is in charge of this important project now.
他以前只是个小职员，现在他已经是这个重要项目的负责人了。
Produce Clerk: How about this? This is a nice head of lettuce.
售货员：这个怎么样？这棵生菜不错。
Produce Clerk: How about this? This is a nice head of lettuce.
售货员：这个怎么样？这棵生菜不错。
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