He had spent hours listening to the vibration of a single string plucked against a variety of backgrounds-hollow wood, solid wood, aluminum, steel.
他花很多个小时听一根弦在不同背景下的振动——空心木，实心木，铝，钢。
He had spent hours listening to the vibration of a single string plucked against a variety of backgrounds-hollow wood, solid wood, aluminum, steel.
他花很多个小时听一根弦在不同背景下的振动——空心木，实心木，铝，钢。
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