Corrected an error in the Checkpoint explanation.
中东冲突爆发一个半月后，连锁快餐行业开始感受到涟漪效应。
，推荐阅读搜狗输入法获取更多信息
Choosing your relativesThis has to be one of 1-2-3's greatest contributions to modern spreadsheets. It still exists, just open up your modern spreadsheet of choice and try it. Enter 1 through 5 down the A column. Starting with B2, enter the formula +$A1+A$2 and copy it down a few rows. Old hands know that a $ symbol in a cell reference fixes that row or column of the reference, otherwise references are relative.
第二届"数龙杯全球AI创新大赛"（报名通道详见文末）