pip install add_pinyin_key

% demo.bib
@article{_ct_2007,
 author = {严汉民 and 黄岗},
 date = {2007},
 journaltitle = {医疗设备信息},
 number = {12},
 pages = {1-5},
 title = {{{降低CT剂量的技术和方法探讨}}},
 urldate = {2018-04-18},
 volume = {22}
}

%demo_mod.bib
@article{_ct_2007,
 author = {严汉民 and 黄岗},
 date = {2007},
 journaltitle = {医疗设备信息},
 key = {yan2han4min2 and huang2gang3},
 number = {12},
 pages = {1-5},
 title = {{{降低CT剂量的技术和方法探讨}}},
 urldate = {2018-04-18},
 volume = {22}
}