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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.，更多细节参见新收录的资料
一个并不复杂的手机失窃案，折射出的却是数字时代，那些因为条件匮乏、跟不上媒介消费迭代的幼童在数字时代的难以承受之重。，更多细节参见新收录的资料