On the back of the card, a 2d bar-code along with a regular one and a magnetic stripe triplicate all the information on the front.
在卡背面，2d条形码，普通码和磁条将所有信息三重储存在卡正面。
2
Sorry, there is something wrong with the magnetic stripe (bar code). It must be replaced. Please borrow it next time.
对不起，该书磁条(条码)有问题，须更换，请下次再借。
3
Experimental results show that this collimation measurement method has high accuracy and good repetition, and can be used in the stripe precise inspection of code-bar invar grade rod.