How do I set Table Rating?

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The most important parameter in the Table Rate is Shipping Table.
Assuming that Table Method is weight which unit is kilogram and the currency is dollar, the expression is written as below:
25:8.50,50:5.5.0,1000:0.00.
It means

weightprice
0~25kg$8.50
26~50kg$5.50
51~1000kg$0.00

Make sure the pattern of expression must like '25:8.50,50:5.5.0'.