Gòu / mǎi / chōng / diàn / bǎo / shí / kě / yǐ / bǐ / jiào / tā / de / háo / ān / shí / róng / liàng购买充电宝时,可以比较它的毫安时容量。When buying a power bank, you can compare its milliampere-hour capacity.