By chiseling a BOL on a surface of a lens, a apochromatic system is composed, which actualizes the system's apochromatism, as well as revising primary aberration.
And for the more adventurous, there's 'spag bol' – spaghetti bolognaise - a budget-friendly bowl of minced beef cooked in a tomato sauce, served on a bed of spaghetti.
刻画
透镜的
系统初级像差的同时，实现了系统的复消色差。
民的一种非正式问好方式，意思是“你好吗”。
版）
来说，还有“spag 
惠的碗， 用番茄酱烹制的碎牛肉， 放在意大利面条上。
