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.
木材和木基制品耐久性。生物侵蚀危害等级的定义。第2部分：实心木材应用。
Durability of wood and wood-based product. Definitions of hazard classes of biological attack. Part 2: application to solid wood.
他总结出空心木更适合做放大，所以他做了几架实心吉他。
He had concluded that hollow wood was inferior for amplification, so he built several solid-body guitars.
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