原始寿命只有687个地球日的欧洲“火星快车”探测器居然在太空中飞行长达20年的时间，欧洲航天局在近期公布了“火星快车”拍摄的一张火星照片，该张照片呈现出蓝色调和暗色调，这些颜色都起源于火山的灰黑色玄武岩沙在
The UISearchDisplayController is very handy and implementing search is pretty straightforward. However, I bump into problem when, in my app, I want to display search result with empty search string b
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