President Obama: Hi, everybody. I've got a special guest with me this week – Macklemore. For those of you who don't share the same love for hip-hop that I do, he's a Grammy-winning artist,
Ambiences work in a most primal way. They can speak directly to our brain subconsciously. 环境声以最原始的方式起着作用。它们可以在潜意识里直接对我们的大脑说话。 So, birds chirping outside your window may indicate normality, 所以，你窗户外面的鸟叫
