Increase indent
The first two requirements (“Efficient” and “Fine-grained”) are important for performance. Imagine a large spreadsheet with millions of cells containing formulas — it would be a huge waste of resources to recalculate every single cell, every time any input changes. Similarly, you don’t want to calculate the value of a cell multiple times if you can help it. In general, we want to do the minimum amount of work possible.
，详情可参考新收录的资料
Олеся Мицкевич (Редактор отдела «Силовые структуры»)
В нескольких микрорайонах Киева пропал свет14:16，这一点在新收录的资料中也有详细论述
– Robertson Davies, The diary of Samuel Marchbanks
}.upper() and .lower()，推荐阅读新收录的资料获取更多信息