Why countries can’t meet the demand for gear against covid-19
A host of efforts are under way to unblock bottlenecks
標題字彙：
- gear 有齒輪的意思，這裡是裝置的意思（the equipment, clothe that you need for a particular activity)
- unblock bottlenneck 打破僵局（瓶頸）
- a host of 許多、一系列
