20rod是多少m？
20rod = 100.584m
是100.584m，所以说成101m也没问题——四舍五入的误差在0.5%以内。
反过来，20m是多少rod？
20m = 3.9768rod
计算公式: m = rod × 5.0292
该数值前后的 rod → m
2 rod10.0584m
4 rod20.1168m
6 rod30.1752m
8 rod40.2336m
10 rod50.292m
12 rod60.3504m
14 rod70.4088m
16 rod80.4672m
18 rod90.5256m
20 rod100.584m
22 rod110.6424m
24 rod120.7008m
26 rod130.7592m
28 rod140.8176m
30 rod150.876m
32 rod160.9344m
34 rod170.9928m
36 rod181.0512m
38 rod191.1096m
40 rod201.168m