When a user taps on a table view item they are in 9 out of 10 cases expecting the outcome to be: a a right to left view transition or b a bottom to top modal view transition.
举例当用户点击一个表视图Table View的时候，他们永远期待二种结果：a新视图从右向左滑进，b新视图从下向上滑进。
Click on the Add a layer mask button at the bottom of the Layers Panel and select the Brush Tool (b).
点击图层面板底部的添加图层蒙版按钮，并选中画笔工具(B)。
B + tree can be viewed as a B-tree in which each node contains only keys (not key-value pairs), and to which an additional level is added at the bottom with linked leaves.
树可以被视为B树，其中每个(内部)节点仅包含键(不是键值对)，并在其底部附加一层链式的叶子节点。
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