Still eager to see more of Romania, I decided to catch a train to Craiova in order to buy a camera, and to then cycle south from there and carry on following the River Danube.
我很想望在罗马尼亚多看一点，于是决定乘火车去克拉约瓦买照相机，然后从那里继续朝南沿多瑙河骑行。
PgUp Cycle to the previous camera position.
循环上一个视窗视角位置。
This class implements camera view and manages the life cycle of camera object.
这个类实现了相机视图和管理相机对象的生命周期。
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