白虾属于常见的食用虾，白虾中也有多种分类，购买虾最好是购买鲜活的，不过白虾缺氧容易死亡，所以冰冻的比较多。虾的营养相对来说比较丰富，它含有的镁能够很好的保护我们的心脑血管。
I\'m developing a simple tab bar application for school. It has 3 tabs. One of them plays mus开发者_开发知识库ic in streaming and I would like to stop the music playing when the user changes the tab.
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