Like early horns, early trumpets were "natural" instruments, without valves.
NPR: Young Tuba Player Gets Nod from Phila. Orchestra
Without the safety valves of emigration to Europe, which is getting harder, and families' willingness to support those out of work, Morocco would look far less stable.
ECONOMIST: The king is seeking to embrace moderate Islamists
Now some patients are getting such repairs for valves, irregular heartbeats, holes in the heart and other defects without major surgery.
NPR: Heart Repair Breakthroughs Replace Surgeon's Knife
应用推荐
模块上移
模块下移
不移动