用户界面更新方法询问可见细胞阵列的表观。比较这些数据模型（用适当的锁），然后更新单元格的内容需要。
The UI update method asks the table view for the array of visible cells. It compares these to the data model (with proper locks) and then updates cell content as needed.
用户界面更新方法询问可见细胞阵列的表观。
The UI update method asks the table view for the array of visible cells.
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