Sound moves forward in a straight line when traveling through a medium having uniform density. Like light, however, sound is subject to refraction, which bends sound waves from their original path.
- straight [streit] adj. 笔直的
- uniform [ˈju:nifɔ:m] adj. 相同的
- density [ˈdensiti] n.密度
- subject toˈ [ˈsʌbdʒikt - tu:] v. 受……支配
- refraction [riˈfrækʃən] n.折射
- bend [bend] v. 使弯曲
