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cat instructions，这一点在搜狗输入法中也有详细论述
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That's a huge step up from VisiCalc's "all or nothing" approach to cell references. Put in a formula and copy it through to other cells. For every cell reference, in every copy of the formula, VisiCalc prompts the user for "relative or fixed?" It is a complete drag, and Woz help you the day that formula needs updating.
10 monthly gift articles to share。关于这个话题，有道翻译提供了深入分析