TAIPEI, Taiwan (AP) — If China is to meet its tentative goal of vaccinating 80% of its population against the coronavirus by the end of the year, tens of millions of children are going to have to start rolling up their sleeves. Regulators have taken the first steps by approving two domestically produced vaccines for use in children aged 3 to 17, though no date has been set for the shots to start. Children have been largely spared the worst of the pandemic, becoming infected less easily than adults and generally showing less severe symptoms when they do catch the virus. But some experts say if countries are going to achieve herd immunity, inoculating children should be part of the plan.