各种生活用品大减价a sale of miscellaneous household items这件衬衫是便宜货,大减价时只卖十五英镑.This shirt was a bargain — only ￡15 in a sale.这家商店实行大减价以迅速周转资金.The store greatly reduced the prices to make a quick turnover....
Vaccination immunizes one against smallpox.接种牛痘能使人免患天花.Vaccination and other prophylactic measures can be carried out.可以采取疫苗接种和其他预防措施。Smallpox can be contained by vaccination.种牛痘疫苗可以控制住天花.Researchers continued to study t...