“under-hammer”的英英意思

单词 under-hammer 释义 under-hammer[under-1 5 b.]In a pianoforte: (see quot. 1860).1840[see hopper1 9].1845G. Dodd Brit. Manuf. IV. 160 The key acts on the ‘grasshopper’, and the ‘grasshopper’ on the ‘under-hammer’.1860Rimbault Pianoforte 396 Under...