刑侦专家李昌钰辞世：毕生追寻真相 心系故土情深
中新网评：今麦郎“手打”商标引争议，文字游戏应当休矣
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她并非不了解汤臣倍健，只是这个品牌在她的认知中，天然属于父母一代。这或许是汤臣倍健最不愿面对的现实：它不是被对手击败，而是被时代绕过。
The fourth requirement (“Dynamic”) ensures that we only create dependencies when they are actually needed. This is easiest to see with conditional formulas, so something like IF(, slow_calculation(B1)). If the condition is true, this formula returns the value of (and therefore depends on) the cell B1. But if the condition is false, the formula returns nothing — and if B1 changes, this cell should not be updated. This is a dynamic dependency — the dependency only exists if is true.