For example, when we work out 0.784 + 0.925 + 0.446, the answer should be 2.155, but we throw away the leading 2, so the answer (in the circle group) is just 0.155.
例如，當在算0.784+0.925+0.446時，其答案應該是2.155，但這裡必須丟掉前面的2，因此其答案（在圓群中）會是0.155。