一般是以0.5kg为单位,按首重+续重计费,首重一般是最贵的,需要170左右,续重一般是30左右。超过21kg的物品,则是按1kg为单位计算,不区分首重。
It is usually calculated in units of 0.5kg, based on the first weight + additional weight. The first weight is usually the most expensive, costing around 170, and the additional weight is usually around 30. For items over 21kg, it is calculated in units of 1kg, regardless of the first weight.