Double String Arrangement的意思|示意

双弦列 Most of Theodore's innovative patents, which are all used in each Steinway piano today, are complete inventions, including iron-bronze alloy for the frame to undergo the multiple tensions of string, the exchangeable integrated action components, the equipment which can compress laminated compressed wood into one shell for the case which, therefore, is not easily cracked and "double string arrangement" which may be the most creative in the world.