在包装品或在书本上的一组粗细不同的线条。它带着和该物品有关的信息。
A group of lines in different thickness used on packaging and book covers and carry information relating to their contents.
条码：在包装品或在书本上的一组粗细不同的线条。它带着和该物品有关的信息。
Bar code: a group of lines in different thickness used on packaging and book covers and carry information relating to their contents.
不同的气体会产生不同的线条，就如人类的指纹，只要分析光谱上的吸收线，便可以知道光波曾经通过的气体成分。
Of the gas. since different gas has different set of lines we can tell which kind of gas it is by analyzing the line spectrum.
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