求看一句嵌套代码，关于列表和for的

support_sample_li = [[feature_mirror_dict[i[0][0]], feature_mirror_dict[i[0][1]], round(i[1], 3)] for i in s]
这一句看不太明白，谢谢

等价于

support_sample_li = []
for i in s:
    support_sample_li.append([feature_mirror_dict[i[0][0]], feature_mirror_dict[i[0][1]], round(i[1], 3)])