The sound heard by a listener when holding a seashell to his ear does not come from the shell itself. It is the echo of the blood pulsing in the listener's own ear.
将一只贝壳贴近耳朵，这时听到的声音不是贝壳本身发出的，而是听者自己耳朵中血流脉搏的回声。
2
Even spaced rhythms pulse and echo in intriguing patterns as lead lines, bold and expressive, seem to speak directly to the listener.