VOA慢速英语:Resounding Earth: Creating Music from Metal

1. expand vi.扩展;发展;张开
例句：I want to expand the medical program and the recreation program.
我要扩充医药工作和康乐活动。

2. practice vi.实行;惯常地进行
例句：Apply a theory to practice.
把理论应用于实践.

3. thoughtful adj.沉思的;体贴的
例句：How thoughtful of you!
考虑得真周到!

4. composer n.（尤指古典音乐）作曲家;调停人;设计者
例句：He is a composer of serious music. I like his music a lot.
他是个庄严音乐的作曲家，我非常喜欢他创作的曲子。